Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings	Treasury Stock	Total
Balances at Dec. 31, 2012	$ 648	$ 18,353	$ (2,392)	$ 153,333	$ (49,587)	$ 120,355
Balances (in shares) at Dec. 31, 2012	5,558,008
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 1	33				34
Stock options exercised (in shares)	5,262
Stock-based compensation	$ 1	933				934
Stock-based compensation (in shares)	16,425
Treasury shares purchased					(212)	(212)
Treasury shares purchased (in shares)	(4,563)
Net income				14,800		14,800
Minimum pension liability adjustments, net of tax expense (benefit) of $344, $(46) and $112 for 2015, 2014 and 2013, respectively			197			197
Mark to market of interest rate hedges, net of tax expense of $241, $317 and $398 for 2015, 2014 and 2013, respectively			697			697
Comprehensive income			894	14,800		15,694
Balances at Dec. 31, 2013	$ 650	19,319	(1,498)	168,133	(49,799)	136,805
Balances (in shares) at Dec. 31, 2013	5,575,132
Increase (Decrease) in Stockholders' Equity
Stock options exercised		(1)				(1)
Stock options exercised (in shares)	9,117
Stock-based compensation	$ 2	1,100				1,102
Stock-based compensation (in shares)	15,268
Treasury shares purchased					(266)	(266)
Treasury shares purchased (in shares)	(4,198)
Cash dividends paid				(2,790)		(2,790)
Net income				19,367		19,367
Minimum pension liability adjustments, net of tax expense (benefit) of $344, $(46) and $112 for 2015, 2014 and 2013, respectively			(81)			(81)
Mark to market of interest rate hedges, net of tax expense of $241, $317 and $398 for 2015, 2014 and 2013, respectively			555			555
Comprehensive income			474	19,367		19,841
Balances at Dec. 31, 2014	$ 652	20,418	(1,024)	184,710	(50,065)	154,691
Balances (in shares) at Dec. 31, 2014	5,595,319
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 0	28				28
Stock options exercised (in shares)	1,000
Stock-based compensation	$ 3	1,196				1,199
Stock-based compensation (in shares)	16,261
Treasury shares purchased					(403)	(403)
Treasury shares purchased (in shares)	(6,899)
Cash dividends paid				(2,798)		(2,798)
Net income				12,886		12,886
Minimum pension liability adjustments, net of tax expense (benefit) of $344, $(46) and $112 for 2015, 2014 and 2013, respectively			602			602
Mark to market of interest rate hedges, net of tax expense of $241, $317 and $398 for 2015, 2014 and 2013, respectively			422			422
Comprehensive income			1,024	12,886		13,910
Balances at Dec. 31, 2015	$ 655	$ 21,642	$ 0	$ 194,798	$ (50,468)	$ 166,627
Balances (in shares) at Dec. 31, 2015	5,605,681