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Significant Accounting Policies - EPS (Details) - $ / shares
 3 Months Ended
Mar. 19, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
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   10,745,000 10,630,000  
Incremental shares issuable upon the assumed exercise of stock options   45,000 35,000  
Unvested restricted stock   521,000 456,000  
Shares used to compute diluted earnings per share   11,311,000 11,121,000  
Common stock, shares authorized   20,000,000   20,000,000
Common stock, par value   $ 0.01   $ 0.01
Common stock, shares issued   11,300,671   11,167,425
Common stock, shares outstanding   11,300,671   11,167,425
Preferred stock, shares authorized   8,000,000   8,000,000
Preferred stock, shares issued   0   0
Preferred stock, shares outstanding   0   0
Dividends declared, per share   $ 0.25    
Dividends paid, per share $ 0.25      
Antidilutive stock options   0 0