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Stock-based Compensation (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 1,804,000  
Weighted average period expected to be recognized 1 year 6 months  
Board Of Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized 38,064  
RSUs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of RSUs outstanding 167,019 254,591
RSUs shares expected to vest 57,144