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Shareholders Equity and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Common Stock          
Beginning balance, value $ 387 $ 387   $ 387  
Beginning balance, shares 38,689,159 38,693,589   38,693,589  
Purchase of shares for cancellation, shares (30,300) (8,400)      
Ending balance, value $ 387 $ 387   $ 387  
Ending balance, shares 38,654,889 38,689,159   38,654,889  
Additional Paid-In Capital          
Beginning balance, value $ 55,784 $ 55,790   $ 55,790  
Purchase of shares for cancellation, value (22) (6)      
Ending balance, value 55,762 55,784   55,762  
Retained Earnings / Accumulated Deficit          
Beginning balance, value (39,414) (39,401)   (39,401)  
Net loss (517) (13)      
Ending balance, value (39,931) (39,414)   (39,931)  
Other Comprehensive Income / Loss          
Beginning balance, value 619 712   712  
Net unrealized gain (loss) on marketable equity securities 244 (93)      
Ending balance, value 863 619   863  
Beginning balance, value 17,376 17,488   $ 17,488  
Purchase of shares for cancellation, value $ (22) (6)      
Purchase of shares for cancellation, shares 30,300   232,000 38,700 406,000
Net loss $ (517) (13)      
Net unrealized gain (loss) on marketable equity securities 244 (93)      
Ending balance, value $ 17,081 $ 17,376   $ 17,081