Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balances at Dec. 31, 2018	$ 30	$ 157,312	$ (106,339)	$ (2,916)	$ (29,004)	$ 19,083
Purchase of shares of treasury stock					(4,722)	(4,722)
Issuance of common shares for the exercise of stock options		3,618				3,618
Non-cash stock compensation expense		1,224				1,224
Dividends declared common share			(19,424)			(19,424)
Other comprehensive income, foreign currency translation adjustment				707		707
Net income			32,406			32,406
Balances at Dec. 31, 2019	30	162,154	(93,357)	(2,209)	(33,726)	32,892
Purchase of shares of treasury stock					(10,001)	(10,001)
Issuance of common shares for the exercise of stock options	1	8,951				8,952
Non-cash stock compensation expense		680				680
Dividends declared common share			(5,278)			(5,278)
Other comprehensive income, foreign currency translation adjustment				(190)		(190)
Net income			37,260			37,260
Balances at Dec. 31, 2020	31	171,785	(61,375)	(2,399)	(43,727)	64,315
Purchase of shares of treasury stock					(6,422)	(6,422)
Issuance of common shares for the exercise of stock options		1,534				1,534
Non-cash stock compensation expense		623				623
Dividends declared common share			(12,203)			(12,203)
Other comprehensive income, foreign currency translation adjustment				24		24
Net income			37,466			37,466
Balances at Dec. 31, 2021	$ 31	$ 173,942	$ (36,112)	$ (2,375)	$ (50,149)	$ 85,337