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, 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 $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively			(20)			(20)
Comprehensive 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 $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively						(26)
Comprehensive 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 $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively			25			25
Comprehensive 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 $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively			(31)			(31)
Comprehensive 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
Balances at Dec. 31, 2019	$ 663	27,464	(1)	243,566	(54,560)	217,132
Balances (in shares) at Dec. 31, 2019	5,622,826
Increase (Decrease) in Stockholders' Equity
Stock options exercised		81				81
Stock options exercised (in shares)	2,000
Stock-based compensation	$ 1	378				379
Stock-based compensation (in shares)	3,063
Treasury shares purchased					(64)	(64)
Treasury shares purchased (in shares)	(704)
Cash dividends paid				(899)		(899)
Net income				5,544		5,544
Mark to market of foreign exchange hedges, net of $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively			(6)			(6)
Comprehensive income			(6)	5,544		5,538
Balances at Mar. 31, 2020	$ 664	27,923	(7)	248,211	(54,624)	222,167
Balances (in shares) at Mar. 31, 2020	5,627,185
Balances at Dec. 31, 2019	$ 663	27,464	(1)	243,566	(54,560)	217,132
Balances (in shares) at Dec. 31, 2019	5,622,826
Increase (Decrease) in Stockholders' Equity
Net income						20,969
Mark to market of foreign exchange hedges, net of $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively						1
Comprehensive income						20,970
Balances at Sep. 30, 2020	$ 664	28,888		261,834	(54,842)	236,544
Balances (in shares) at Sep. 30, 2020	5,630,761
Balances at Mar. 31, 2020	$ 664	27,923	(7)	248,211	(54,624)	222,167
Balances (in shares) at Mar. 31, 2020	5,627,185
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		463				463
Stock-based compensation (in shares)	3,143
Treasury shares purchased					(218)	(218)
Treasury shares purchased (in shares)	(2,459)
Cash dividends paid				(901)		(901)
Net income				6,101		6,101
Mark to market of foreign exchange hedges, net of $2 tax benefit and $6 tax benefit for the three months ended March 31, 2020 and 2019, respectively, and $2 tax expense and $7 tax expense for the three months ended June 30, 2020 and 2019, respectively			7			7
Comprehensive income			$ 7	6,101		6,108
Balances at Jun. 30, 2020	$ 664	28,386		253,411	(54,842)	227,619
Balances (in shares) at Jun. 30, 2020	5,627,869
Increase (Decrease) in Stockholders' Equity
Stock options exercised (in shares)	2,945
Stock-based compensation		502				502
Stock-based compensation (in shares)	(53)
Cash dividends paid				(901)		(901)
Net income				9,324		9,324
Comprehensive income				9,324		9,324
Balances at Sep. 30, 2020	$ 664	$ 28,888		$ 261,834	$ (54,842)	$ 236,544
Balances (in shares) at Sep. 30, 2020	5,630,761