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Significant Accounting Policies - EPS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 18, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
May 18, 2018
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   10,879,000 10,680,000 10,812,000 10,655,000    
Incremental shares issuable upon the assumed exercise of stock options   51,000 41,000 48,000 38,000    
Unvested restricted stock   450,000 469,000 486,000 462,000    
Shares used to compute diluted earnings per share   11,380,000 11,190,000 11,346,000 11,155,000    
Common stock, shares authorized   20,000,000   20,000,000     20,000,000
Common stock, par value   $ 0.01   $ 0.01     $ 0.01
Common stock, shares issued   11,306,527   11,306,527     11,167,425
Common stock, shares outstanding   11,306,527   11,306,527     11,167,425
Preferred stock, shares authorized   8,000,000   8,000,000     8,000,000
Preferred stock, shares issued   0   0     0
Preferred stock, shares outstanding   0   0     0
Dividends declared, per share           $ 0.25  
Dividends paid, per share $ 0.25            
Antidilutive stock options   0 0 0 0