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Stockholders' Equity - Summary of common shareholders' equity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     $ 27,117  
Net Income $ 671 $ 366 802 $ 1,628
Purchase of treasury shares     (203)  
Cash dividend     (376)  
Stock based compensation, net of tax benefit     184  
Closing Balance $ 27,524   $ 27,524  
Closing Balance (shares) 2,614,506   2,614,506  
ESOT        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     $ (763)  
Closing Balance $ (763)   (763)  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     $ 523  
Opening Balance (shares)     2,614,506  
Closing Balance $ 523   $ 523  
Closing Balance (shares) 2,614,506   2,614,506  
Capital in excess of par value        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     $ 14,160  
Stock based compensation, net of tax benefit     8  
Closing Balance $ 14,168   14,168  
Retained earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     14,768  
Net Income     802  
Cash dividend     (376)  
Closing Balance 15,194   15,194  
Treasury stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     (1,551)  
Purchase of treasury shares     (203)  
Stock based compensation, net of tax benefit     176  
Closing Balance (1,578)   (1,578)  
Accumulated other comprehensive loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Opening Balance     (20)  
Closing Balance $ (20)   $ (20)