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Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Common Stock        
Beginning balance, shares     58,133,066 58,171,466
Beginning balance, value     $ 581 $ 582
Purchase of shares for cancellation, shares     (21,100) (33,200)
Purchase of shares for cancellation, value     $ 0 $ (1)
Ending balance, shares 58,111,966 58,138,266 58,111,966 58,138,266
Ending balance, value $ 581 $ 581 $ 581 $ 581
Additional Paid-in Capital        
Beginning balance, value     70,204 69,873
Stock option expense     215 173
Purchase of shares for cancellation, value     (4) (10)
Ending balance, value 70,415 70,036 70,415 70,036
Accumulated Deficit        
Beginning balance, value     (46,654) (43,365)
Net loss     (352) (1,443)
Ending balance, value (47,006) (44,808) (47,006) (44,808)
Beginning balance, value     24,131 27,090
Stock option expense     215 173
Purchase of shares for cancellation, value     (4) (11)
Net loss 255 (1,002) (352) (1,443)
Ending balance, value $ 23,990 $ 25,809 $ 23,990 $ 25,809