Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock	Total
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		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 $344 tax expense for 2015			602			602
Mark to market of interest rate hedges, net of of $241 tax expense for 2015			422			422
Comprehensive (loss) income			1,024	12,886		13,910
Balances at Dec. 31, 2015	$ 655	21,642		194,798	(50,468)	166,627
Balances (in shares) at Dec. 31, 2015	5,605,681
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 1	154				155
Stock options exercised (in shares)	5,683
Stock-based compensation	$ 1	1,035				1,036
Stock-based compensation (in shares)	16,708
Treasury shares purchased					(2,928)	$ (2,928)
Treasury shares purchased (in shares)	(53,932)					(50,068)
Cash dividends paid				(2,782)		$ (2,782)
Net income				17,754		17,754
Mark to market of foreign exchange hedges, net of $155 tax expense and $129 tax benefit for 2017 and 2016, respectively			(223)			(223)
Comprehensive (loss) income			(223)	17,754		17,531
Balances at Dec. 31, 2016	$ 657	22,831	(223)	209,770	(53,396)	179,639
Balances (in shares) at Dec. 31, 2016	5,574,140
Increase (Decrease) in Stockholders' Equity
Stock options exercised		73				73
Stock options exercised (in shares)	2,000
Stock-based compensation	$ 2	1,403				1,405
Stock-based compensation (in shares)	16,695
Treasury shares purchased					(309)	$ (309)
Treasury shares purchased (in shares)	(4,014)					0
Cash dividends paid				(3,013)		$ (3,013)
Net income				27,148		27,148
Mark to market of foreign exchange hedges, net of $155 tax expense and $129 tax benefit for 2017 and 2016, respectively			309			309
Comprehensive (loss) income			309	27,148		27,457
Balances at Dec. 31, 2017	$ 659	$ 24,307	$ 86	$ 233,905	$ (53,705)	$ 205,252
Balances (in shares) at Dec. 31, 2017	5,588,821