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Common Stock Options (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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  
Recognized compensation expense $ 11 $ 15
Exercised, Number of Shares 0 0
Unrecognized compensation expense $ 15  
Number of years to recognize remaining expense 3 years  
Vice President [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options expiration from date of grant   10 years
Granted, Number of Shares   25,000
Stock Option Vesting Period   4 years
Vice President [Member] | Vested on grant date    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting Percentage   20.00%
Vice President [Member] | Vesting on the first four anniversaries of the grant date    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting Percentage   20.00%
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 300,000  
Number of shares available for grant 275,000  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 3.64
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