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Common Stock Options (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options fair market value 100.00%  
Options expiration from date of grant 10 years  
Options expiration from date of death 1 year  
Granted, Number of Shares 0 0
Recognized compensation expense $ 5 $ 6
Exercised, Number of Shares 0 0
Unrecognized compensation expense $ 4  
Number of years to recognize remaining expense 1 year  
2013 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum amount of options authorized 600,000  
Number of shares available for purchase 325,000  
Number of shares exercisable 320,000  
Number of shares available for grant 275,000  
1997 Stock Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum amount of options authorized 450,000  
Number of shares available for purchase 7,500  
Number of shares exercisable 7,500