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Shareholders' Equity and Accumulated Other Comprehensive Income - Shareholders' Equity and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Net loss $ (613)   $ (273) $ (1,617) $ (379)  
Common Stock            
Balance, 58,434,566 shares           $ 584
Purchase of shares for cancellation; (52,614) at March 31, 2018 (92,586) at June 30, 2018 (1)          
Balance, 58,381,952 shares at March 31, 2018 58,289,366 shares at June 30, 2018 583 $ 584        
Additional Paid-In Capital            
Balance, 58,434,566 shares           69,312
Stock option expense 432 10        
Purchase of shares for cancellation; (52,614) at March 31, 2018 (92,586) at June 30, 2018 (38) (26)        
Balance, 58,381,952 shares at March 31, 2018 58,289,366 shares at June 30, 2018 69,690 69,296        
AccumulatedDeficit            
Balance, 58,434,566 shares           (39,767)
Net loss (613) (1,004)        
Balance, 58,381,952 shares at March 31, 2018 58,289,366 shares at June 30, 2018 (41,384) (40,771)        
Total Shareholders' Equity            
Balance, 58,434,566 shares           $ 30,129
Stock option expense 432 10        
Purchase of shares for cancellation; (52,614) at March 31, 2018 (92,586) at June 30, 2018 (39) (26)        
Net loss (613) (1,004)        
Balance, 58,381,952 shares at March 31, 2018 58,289,366 shares at June 30, 2018 $ 28,889 $ 29,109