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, 2019	$ 30	$ 162,154	$ (93,357)	$ (2,209)	$ (33,726)	$ 32,892
Purchase of shares treasury stock	0	0	0	0	(10,001)	(10,001)
Issuance of common shares for the exercise of stock options	1	8,951	0	0	0	8,952
Forfeiture of restricted common shares	0	0	0	0	0	0
Non-cash stock compensation expense	0	680	0	0	0	680
Dividends declared	0	0	(5,278)	0	0	(5,278)
Other comprehensive loss, foreign currency translation adjustment	0	0	0	(190)	0	(190)
Net income	0	0	37,260	0	0	37,260
Reclassification of cumulative foreign currency translation adjustment into earnings						0
Balances at Dec. 31, 2020	31	171,785	(61,375)	(2,399)	(43,727)	64,315
Purchase of shares treasury stock	0	0	0	0	(6,422)	(6,422)
Issuance of common shares for the exercise of stock options	0	1,534	0	0	0	1,534
Non-cash stock compensation expense	0	623	0	0	0	623
Dividends declared	0	0	(12,203)	0	0	(12,203)
Other comprehensive loss, foreign currency translation adjustment	0	0	0	24	0	24
Net income	0	0	37,466	0	0	37,466
Reclassification of cumulative foreign currency translation adjustment into earnings						0
Balances at Dec. 31, 2021	31	173,942	(36,112)	(2,375)	(50,149)	85,337
Purchase of shares treasury stock	0	0	0	0	(28,118)	(28,118)
Issuance of common shares for the exercise of stock options	0	311	0	0	0	311
Non-cash stock compensation expense	0	1,200	0	0	0	1,200
Dividends declared	0	0	(20,872)	0	0	(20,872)
Other comprehensive loss, foreign currency translation adjustment	0	0	0	(194)	0	(194)
Net income	0	0	31,800	0	0	31,800
Reclassification of cumulative foreign currency translation adjustment into earnings	0	0	0	$ 2,569	0	2,569
Balances at Dec. 31, 2022	$ 31	$ 175,453	$ (25,184)		$ (78,267)	$ 72,033