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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 |

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