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Basis of Presentation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Weighted average basic shares outstanding (shares) 6,078 5,945 6,063 5,933  
Add: Potentially dilutive common shares related to stock options (shares) 27 41 31 44  
Potential common shares related to unvested restricted stock (shares) 4 3 6 4  
Potential common shares related to warrants (shares) 0 73 0 74  
Weighted average diluted shares outstanding (shares) 6,109 6,062 6,100 6,055  
Net income $ 4,837 $ 4,286 $ 10,483 $ 8,743 $ 18,441
Basic EPS (usd per share) $ 0.80 $ 0.72 $ 1.73 $ 1.47  
Diluted EPS (usd per share) $ 0.79 $ 0.71 $ 1.72 $ 1.44  
Weighted average anti-dilutive shares not included in the calculation of diluted EPS 70 41 60 34