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Stock Incentive Plan And Employee Stock Purchase Plan (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 42 Months Ended 129 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of common stock issued for ESPP 713 807 1,038 1,289          
Stock Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted 0   0   0 0      
Unrecognized compensation cost $ 0       $ 0     $ 0  
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Awards granted 0   0   12,009 32,210   199,308  
Stock compensation expense $ 61,000   $ (3,000)   $ 307,000 $ 189,000      
Minimum [Member] | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         3 years        
Maximum [Member] | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         9 years        
2010 Stock Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         10 years        
Award expiration date         Jun. 20, 2029        
Shares available for issuance 440,805       440,805     440,805  
2010 Stock Incentive Plan [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized                 756,356
Employee Stock Purchase Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized 350,000       350,000     350,000  
Shares of common stock issued for ESPP             16,781    
Minimum work hours per week         20 hours        
Minimum months to be eligible to participate         5 months        
Purchase price for share percentage equal to fair value of such shares         95.00%        
Maximum discount to fair value percentage         15.00%        
Employee stock purchase plan, discount expense $ 1,000   $ 1,000   $ 1,000 $ 1,000