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)	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 tax expense (benefit) of $0, $4 and $(29) for 2020, 2019 and 2018, 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
Increase (Decrease) in Stockholders' Equity
Stock options exercised		75				75
Stock options exercised (in shares)	2,000
Stock-based compensation	$ 2	1,522				1,524
Stock-based compensation (in shares)	18,900
Treasury shares purchased					(444)	$ (444)
Treasury shares purchased (in shares)	(5,475)					0
Cash dividends paid				(33,058)		$ (33,058)
Net income				26,056		26,056
Mark to market of foreign exchange hedges, net of tax expense (benefit) of $0, $4 and $(29) for 2020, 2019 and 2018, respectively			12			12
Comprehensive income			12	26,056		26,068
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	$ 1	80				81
Stock options exercised (in shares)	12,271
Stock-based compensation	$ 2	1,913				1,915
Stock-based compensation (in shares)	18,609
Treasury shares purchased					(557)	(557)
Treasury shares purchased (in shares)	(5,622)
Cash dividends paid				(3,603)		(3,603)
Net income				28,223		28,223
Mark to market of foreign exchange hedges, net of tax expense (benefit) of $0, $4 and $(29) for 2020, 2019 and 2018, respectively			1			1
Comprehensive income			1	28,223		28,224
Balances at Dec. 31, 2020	$ 666	$ 29,457	$ 0	$ 268,186	$ (55,117)	$ 243,192
Balances (in shares) at Dec. 31, 2020	5,648,084