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, 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 $29 tax benefit and $155 tax expense and $129 tax benefit for 2018, 2017 and 2016, respectively			$ (223)			(223)
Comprehensive 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 $29 tax benefit and $155 tax expense and $129 tax benefit for 2018, 2017 and 2016, respectively			309			309
Comprehensive 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
Increase (Decrease) in Stockholders' Equity
Stock options exercised		73				73
Stock options exercised (in shares)	6,339
Stock-based compensation	$ 2	1,487				1,489
Stock-based compensation (in shares)	17,626
Treasury shares purchased					(411)	$ (411)
Treasury shares purchased (in shares)	(5,385)					0
Cash dividends paid				(3,022)		$ (3,022)
Net income				19,685		19,685
Mark to market of foreign exchange hedges, net of $29 tax benefit and $155 tax expense and $129 tax benefit for 2018, 2017 and 2016, respectively			(99)			(99)
Comprehensive income			(99)	19,685		19,586
Balances at Dec. 31, 2018	$ 661	$ 25,867	$ (13)	$ 250,568	$ (54,116)	$ 222,967
Balances (in shares) at Dec. 31, 2018	5,607,401