Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balances at Dec. 31, 2021	$ 161	$ 24	$ 149,406	$ (23,662)	$ (1,306)	$ 225,076	$ 349,699
Net income	0	0	0	0	0	22,167	22,167
Cash dividend	0	0	0	0	0	(1,047)	(1,047)
Other comprehensive income (loss)	0	0	0	0	1,006	0	1,006
Share repurchase	0	0	0	(14,800)	0	0	(14,800)
Stock-based employee compensation expense	0	0	1,893	0	0	0	1,893
Issuance of restricted shares, net	0	0	(863)	827	0	0	(36)
Balances at Mar. 31, 2022	161	24	150,436	(37,635)	(300)	246,196	358,882
Balances at Dec. 31, 2021	161	24	149,406	(23,662)	(1,306)	225,076	349,699
Balances at Dec. 31, 2022	161	24	152,886	(106,500)	1,086	329,471	377,128
Net income	0	0	0	0	0	16,635	16,635
Cash dividend	0	0	0	0	0	(1,466)	(1,466)
Other comprehensive income (loss)	0	0	0	0	(403)	0	(403)
Share repurchase	0	0	0	(20,805)	0	0	(20,805)
Stock-based employee compensation expense	0	0	1,558	0	0	0	1,558
Issuance of restricted shares, net	0	0	(1,523)	38	0	0	(1,485)
Balances at Mar. 31, 2023	$ 161	$ 24	$ 152,921	$ (127,267)	$ 683	$ 344,640	$ 371,162