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Significant Accounting Policies - EPS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share      
Weighted average shares outstanding used to compute basic earnings per share 10,610,000 10,588,000 10,561,000
Incremental shares issuable upon the assumed exercise of stock options 5,000 6,000 6,000
Unvested restricted stock 230,000 146,000 83,000
Shares used to compute diluted earnings per share 10,845,000 10,740,000 10,650,000
Common stock, shares authorized 20,000,000 20,000,000  
Common stock, par value $ 0.01 $ 0.01  
Common stock, shares issued 11,093,489 11,027,177  
Common stock, shares outstanding 11,093,489 11,027,177  
Preferred stock, shares authorized 8,000,000    
Preferred stock, shares issued 0    
Preferred stock, shares outstanding 0