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, Common [Member]	Total
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 income, 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 income, 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)	0	(78,267)	72,033
Purchase of shares treasury stock	0	0	0	0	(20,492)	(20,492)
Issuance of common shares for the exercise of stock options	0	1,825	0	0	0	1,825
Non-cash stock compensation expense	0	935	0	0	0	935
Dividends declared	0	0	(36,317)	0	0	(36,317)
Other comprehensive income, foreign currency translation adjustment						0
Net income	0	0	30,971	0	0	30,971
Reclassification of cumulative foreign currency translation adjustment into earnings						(0)
Balances at Dec. 31, 2023	$ 31	$ 178,213	$ (30,530)	$ 0	$ (98,759)	$ 48,955