Net Income per Share - Reconciliation of Calculation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 2,824	$ 2,428	$ 7,029	$ 4,367
Weighted average common shares outstanding - Basic (in shares)	8,471	8,425	8,465	8,421
Plus: Potential dilutive common stock equivalents (in shares)	137	99	132	98
Weighted average common shares outstanding - Diluted (in shares)	8,608	8,524	8,597	8,519
Net income per common share - Basic (in dollars per share)	$ 0.33	$ 0.29	$ 0.83	$ 0.52
Net income per common share - Diluted (in dollars per share)	$ 0.33	$ 0.28	$ 0.82	$ 0.51
Stock options and common stock excluded from the income per share calculation as their effect would have been anti-dilutive (in shares)	153	141	170	127