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, 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 $2 tax expense for the three months ended March 31, 2020 and June 30, 2020, 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 $2 tax expense for the three months ended March 31, 2020 and June 30, 2020, 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 $2 tax expense for the three months ended March 31, 2020 and June 30, 2020, 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
Mark to market of foreign exchange hedges, net of $2 tax benefit and $2 tax expense for the three months ended March 31, 2020 and June 30, 2020, respectively						0
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
Balances at Dec. 31, 2020	$ 666	29,457		268,186	(55,117)	243,192
Balances (in shares) at Dec. 31, 2020	5,648,084
Increase (Decrease) in Stockholders' Equity
Stock options exercised (in shares)	3,310
Stock-based compensation	$ 1	546				547
Stock-based compensation (in shares)	2,685
Treasury shares purchased					(95)	(95)
Treasury shares purchased (in shares)	(743)
Cash dividends paid				(905)		(905)
Net income				7,031		7,031
Comprehensive income				7,031		7,031
Balances at Mar. 31, 2021	$ 667	30,003		274,312	(55,212)	249,770
Balances (in shares) at Mar. 31, 2021	5,653,336
Balances at Dec. 31, 2020	$ 666	29,457		268,186	(55,117)	243,192
Balances (in shares) at Dec. 31, 2020	5,648,084
Increase (Decrease) in Stockholders' Equity
Net income						29,432
Mark to market of foreign exchange hedges, net of $2 tax benefit and $2 tax expense for the three months ended March 31, 2020 and June 30, 2020, respectively						0
Comprehensive income						29,432
Balances at Sep. 30, 2021	$ 667	31,217		294,903	(55,212)	271,575
Balances (in shares) at Sep. 30, 2021	5,658,467
Balances at Mar. 31, 2021	$ 667	30,003		274,312	(55,212)	249,770
Balances (in shares) at Mar. 31, 2021	5,653,336
Increase (Decrease) in Stockholders' Equity
Stock options exercised		83				83
Stock options exercised (in shares)	2,000
Stock-based compensation		571				571
Stock-based compensation (in shares)	3,145
Cash dividends paid				(904)		(904)
Net income				11,093		11,093
Comprehensive income				11,093		11,093
Balances at Jun. 30, 2021	$ 667	30,657		284,501	(55,212)	260,613
Balances (in shares) at Jun. 30, 2021	5,658,481
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		560				560
Stock-based compensation (in shares)	(14)
Cash dividends paid				(906)		(906)
Net income				11,308		11,308
Mark to market of foreign exchange hedges, net of $2 tax benefit and $2 tax expense for the three months ended March 31, 2020 and June 30, 2020, respectively						0
Comprehensive income				11,308		11,308
Balances at Sep. 30, 2021	$ 667	$ 31,217		$ 294,903	$ (55,212)	$ 271,575
Balances (in shares) at Sep. 30, 2021	5,658,467