| 
                 
                    Closing price on 7/25/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    4.70 | 
                 
                
                    | High | 
                    4.70 | 
                 
                
                    | Low | 
                    4.50 | 
                     
                
                    | Volume | 
                    7,300 | 
                                 
                
                    | Split-adjusted Price | 
                    4.10 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
SD2 Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                7/25/2019
             | 
            
                -0.40 / -8.16%
             |             
            
                4.70
             |           
            
                4.70
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.69
             |                     
            
                4.10
             |                                 
            
                7,300
             |            
            
                 
             |                                       
         
    
        
            | 
                7/24/2019
             | 
            
                +0.20 / +4.26%
             |             
            
                4.50
             |           
            
                4.90
             |               
            
                4.50
             |                           
            
                4.90
             | 
            
                4.63
             |                     
            
                4.46
             |                                 
            
                3,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/23/2019
             | 
            
                -0.50 / -9.62%
             |             
            
                4.70
             |           
            
                4.70
             |               
            
                4.70
             |                           
            
                4.70
             | 
            
                4.70
             |                     
            
                4.28
             |                                 
            
                400
             |            
            
                 
             |                                       
         
    
        
            | 
                7/22/2019
             | 
            
                +0.40 / +8.33%
             |             
            
                4.50
             |           
            
                5.20
             |               
            
                4.40
             |                           
            
                5.20
             | 
            
                4.82
             |                     
            
                4.73
             |                                 
            
                11,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/19/2019
             | 
            
                -0.30 / -5.88%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                4.80
             | 
            
                4.84
             |                     
            
                4.37
             |                                 
            
                900
             |            
            
                 
             |                                       
         
    
        
            | 
                7/18/2019
             | 
            
                -0.10 / -1.92%
             |             
            
                5.00
             |           
            
                5.20
             |               
            
                4.70
             |                           
            
                5.10
             | 
            
                4.79
             |                     
            
                4.64
             |                                 
            
                20,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/17/2019
             | 
            
                -0.50 / -8.77%
             |             
            
                5.20
             |           
            
                5.70
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.23
             |                     
            
                4.73
             |                                 
            
                3,800
             |            
            
                 
             |                                       
         
    
        
            | 
                7/16/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.70
             |               
            
                5.20
             |                           
            
                5.70
             | 
            
                5.23
             |                     
            
                5.19
             |                                 
            
                3,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/15/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.80
             |           
            
                5.80
             |               
            
                5.20
             |                           
            
                5.70
             | 
            
                5.30
             |                     
            
                5.19
             |                                 
            
                8,900
             |            
            
                 
             |                                       
         
    
        
            | 
                7/12/2019
             | 
            
                -0.60 / -9.52%
             |             
            
                5.70
             |           
            
                5.70
             |               
            
                5.70
             |                           
            
                5.70
             | 
            
                5.70
             |                     
            
                5.19
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/11/2019
             | 
            
                0.00 / 0.00%
             |             
            
                6.30
             |           
            
                6.30
             |               
            
                6.30
             |                           
            
                6.30
             | 
            
                6.30
             |                     
            
                5.74
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                7/10/2019
             | 
            
                0.00 / 0.00%
             |             
            
                6.30
             |           
            
                6.30
             |               
            
                6.30
             |                           
            
                6.30
             | 
            
                6.30
             |                     
            
                5.74
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/9/2019
             | 
            
                0.00 / 0.00%
             |             
            
                6.30
             |           
            
                6.30
             |               
            
                6.30
             |                           
            
                6.30
             | 
            
                6.30
             |                     
            
                5.74
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                7/8/2019
             | 
            
                -0.10 / -1.56%
             |             
            
                5.80
             |           
            
                6.30
             |               
            
                5.80
             |                           
            
                6.30
             | 
            
                5.82
             |                     
            
                5.74
             |                                 
            
                2,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/5/2019
             | 
            
                -0.10 / -1.54%
             |             
            
                6.40
             |           
            
                6.40
             |               
            
                6.40
             |                           
            
                6.40
             | 
            
                6.40
             |                     
            
                5.83
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                7/4/2019
             | 
            
                +0.50 / +8.33%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.50
             |                     
            
                5.92
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/3/2019
             | 
            
                +0.50 / +9.09%
             |             
            
                6.00
             |           
            
                6.00
             |               
            
                6.00
             |                           
            
                6.00
             | 
            
                6.00
             |                     
            
                5.46
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                7/2/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.50
             |           
            
                5.50
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.50
             |                     
            
                5.01
             |                                 
            
                60
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/1/2019
             | 
            
                +0.20 / +3.77%
             |             
            
                5.50
             |           
            
                5.50
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.50
             |                     
            
                5.01
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                6/28/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                4.83
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/27/2019
             | 
            
                -0.30 / -5.36%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.30
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                4.83
             |                                 
            
                400
             |            
            
                 
             |                                       
         
    
        
            | 
                6/26/2019
             | 
            
                -0.50 / -8.20%
             |             
            
                5.50
             |           
            
                6.00
             |               
            
                5.50
             |                           
            
                5.60
             | 
            
                5.65
             |                     
            
                5.10
             |                                 
            
                2,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/25/2019
             | 
            
                +0.50 / +8.93%
             |             
            
                6.10
             |           
            
                6.10
             |               
            
                6.10
             |                           
            
                6.10
             | 
            
                6.10
             |                     
            
                5.55
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                6/24/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.60
             |                           
            
                5.60
             | 
            
                5.60
             |                     
            
                5.10
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/21/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.60
             |                           
            
                5.60
             | 
            
                5.60
             |                     
            
                5.10
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                6/20/2019
             | 
            
                +0.50 / +9.80%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.60
             |                           
            
                5.60
             | 
            
                5.60
             |                     
            
                5.10
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/19/2019
             | 
            
                -0.10 / -1.92%
             |             
            
                5.10
             |           
            
                5.10
             |               
            
                5.10
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                4.64
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                6/18/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.20
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                4.73
             |                                 
            
                7,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/17/2019
             | 
            
                -0.20 / -3.70%
             |             
            
                5.20
             |           
            
                5.20
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                4.73
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                6/14/2019
             | 
            
                -0.10 / -1.82%
             |             
            
                5.00
             |           
            
                5.40
             |               
            
                5.00
             |                           
            
                5.40
             | 
            
                5.04
             |                     
            
                4.92
             |                                 
            
                1,100
             |  
            
                 
             |                                                              
             
    
         
    
    
 |