CONDENSED 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, 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)	2,000
Stock-based compensation		316				316
Stock-based compensation (in shares)	2,733
Treasury shares purchased					(61)	(61)
Treasury shares purchased (in shares)	(861)
Cash dividends paid				(755)		(755)
Net income				4,262		4,262
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively			(34)			(34)
Comprehensive (loss) income			(34)	4,262		4,228
Balances at Mar. 31, 2018	$ 659	24,696	52	237,412	(53,766)	209,053
Balances (in shares) at Mar. 31, 2018	5,592,693
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
Net income						15,454
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively						(113)
Comprehensive (loss) income						15,341
Balances at Sep. 30, 2018	$ 660	25,523	(27)	247,093	(53,956)	219,293
Balances (in shares) at Sep. 30, 2018	5,597,950
Balances at Mar. 31, 2018	$ 659	24,696	52	237,412	(53,766)	209,053
Balances (in shares) at Mar. 31, 2018	5,592,693
Increase (Decrease) in Stockholders' Equity
Stock options exercised (in shares)	3,200
Stock-based compensation	$ 1	396				397
Stock-based compensation (in shares)	4,319
Treasury shares purchased					(190)	(190)
Treasury shares purchased (in shares)	(2,262)
Cash dividends paid				(756)		(756)
Net income				6,638		6,638
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively			(55)			(55)
Comprehensive (loss) income			(55)	6,638		6,583
Balances at Jun. 30, 2018	$ 660	25,092	(3)	243,294	(53,956)	215,087
Balances (in shares) at Jun. 30, 2018	5,597,950
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		431				431
Cash dividends paid				(755)		(755)
Net income				4,554		4,554
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively			(24)			(24)
Comprehensive (loss) income			(24)	4,554		4,530
Balances at Sep. 30, 2018	$ 660	25,523	(27)	247,093	(53,956)	219,293
Balances (in shares) at Sep. 30, 2018	5,597,950
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
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		309				309
Stock-based compensation (in shares)	3,333
Treasury shares purchased					(52)	(52)
Treasury shares purchased (in shares)	(753)
Cash dividends paid				(757)		(757)
Net income				5,128		5,128
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively			(20)			(20)
Comprehensive (loss) income			(20)	5,128		5,108
Balances at Mar. 31, 2019	$ 661	26,176	(33)	254,939	(54,168)	227,575
Balances (in shares) at Mar. 31, 2019	5,609,981
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
Increase (Decrease) in Stockholders' Equity
Net income						21,063
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively						(26)
Comprehensive (loss) income						21,037
Balances at Sep. 30, 2019	$ 662	27,045	(39)	269,358	(54,357)	242,669
Balances (in shares) at Sep. 30, 2019	5,612,772
Balances at Mar. 31, 2019	$ 661	26,176	(33)	254,939	(54,168)	227,575
Balances (in shares) at Mar. 31, 2019	5,609,981
Increase (Decrease) in Stockholders' Equity
Stock options exercised		75				75
Stock options exercised (in shares)	2,000
Stock-based compensation	$ 1	381				382
Stock-based compensation (in shares)	3,173
Treasury shares purchased					(189)	(189)
Treasury shares purchased (in shares)	(2,361)
Cash dividends paid				(760)		(760)
Net income				6,033		6,033
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively			25			25
Comprehensive (loss) income			25	6,033		6,058
Balances at Jun. 30, 2019	$ 662	26,632	(8)	260,212	(54,357)	233,141
Balances (in shares) at Jun. 30, 2019	5,612,793
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		413				413
Stock-based compensation (in shares)	(21)
Cash dividends paid				(756)		(756)
Net income				9,902		9,902
Mark to market of foreign exchange hedges, net of $6 tax benefit and $10 tax benefit and $7 tax expense and $17 tax benefit and $8 tax benefit and $8 tax benefit for the three months ended March 31, 2019 and 2018 and three months ended June 30, 2019 and 2018 and three months ended September 30, 2019 and 2018, respectively			(31)			(31)
Comprehensive (loss) income			(31)	9,902		9,871
Balances at Sep. 30, 2019	$ 662	$ 27,045	$ (39)	$ 269,358	$ (54,357)	$ 242,669
Balances (in shares) at Sep. 30, 2019	5,612,772