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Common Stock Options (Schedule Of Stock Options Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of Shares 0 0  
Exercised, Number of Shares 0 0  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, Number of Shares 125,000 125,000  
Granted, Number of Shares 0 0  
Exercised, Number of Shares 0 0  
Canceled/forfeited/expired, Number of Shares 0 0  
Ending balance, Number of Shares 125,000 125,000 125,000
Number of shares vested 115,000    
Beginning balance, Weighted-Average Exercise Price $ 3.78 $ 3.78  
Ending balance, Weighted-Average Exercise Price $ 3.78 $ 3.78 $ 3.78
Balance, Weighted-Average Remaining Contractual Term 6 years 1 month 6 days 7 years 1 month 6 days 8 years 1 month 6 days
Vested and exercisable, Aggregate Intrinsic Value [1] $ 118    
Director Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, Number of Shares 207,500 207,500  
Granted, Number of Shares 0 0  
Exercised, Number of Shares 0 0  
Canceled/forfeited/expired, Number of Shares 0 0  
Ending balance, Number of Shares 207,500 207,500 207,500
Number of shares vested 207,500    
Beginning balance, Weighted-Average Exercise Price $ 4.62 $ 4.62  
Ending balance, Weighted-Average Exercise Price $ 4.62 $ 4.62 $ 4.62
Balance, Weighted-Average Remaining Contractual Term 2 years 4 months 24 days 3 years 4 months 24 days 4 years 4 months 24 days
Vested and exercisable, Aggregate Intrinsic Value [1] $ 40    
[1] The aggregate intrinsic value is calculated as approximately the difference between the weighted average exercise price of the underlying awards and the Company’s estimated current fair market value at December 31, 2020.