CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	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 tax benefit of $2 for 2020 period			(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, 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