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Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Common Stock        
Beginning balance, shares 58,111,966 58,138,266 58,133,066 58,171,466
Beginning balance, value $ 581 $ 581 $ 581 $ 582
Purchase of shares for cancellation, shares (3,600) (2,900) (24,700) (36,100)
Purchase of shares for cancellation, value       $ (1)
Net loss
Ending balance, shares 58,108,366 58,135,366 58,108,366 58,135,366
Ending balance, value $ 581 $ 581 $ 581 $ 581
Additional Paid-in Capital        
Beginning balance, value 70,415 70,036 70,204 69,873
Stock option expense 72 85 287 258
Purchase of shares for cancellation, value (1) (1) (5) (11)
Net loss
Ending balance, value 70,486 70,120 70,486 70,120
Accumulated Deficit        
Beginning balance, value (47,006) (44,808) 46,654 (43,365)
Net loss (53) (1,480) (405) (2,923)
Ending balance, value (47,059) (46,288) (47,059) (46,288)
Beginning balance, value 23,990 25,809 24,131 27,090
Stock option expense 72 85 287 258
Purchase of shares for cancellation, value (1) (1) (5) (12)
Net loss (53) (1,480) (405) (2,923)
Ending balance, value $ 24,008 $ 24,413 $ 24,008 $ 24,413