CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Balance (in shares) at Dec. 31, 2021		11,594
Balance at Dec. 31, 2021	$ 202,474	$ 12	$ 12,018	$ 111	$ 190,333	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,781				41,781
Share-based compensation (in shares)		18
Share-based compensation	$ 2,275		2,275
Options exercised by directors (in shares)	0
Net shares repurchased for employee taxes (in shares)		(8)
Net shares repurchased for employee taxes	$ (1,459)		(1,459)
Treasury stock from stock repurchases	(10,000)					(10,000)
Treasury stock retired from stock repurchases (in shares)		(51)
Treasury stock retired from stock repurchases	0				(10,000)	10,000
Other comprehensive income	16			16
Cash dividends declared to stockholders	(19,063)				(19,063)
Balance (in shares) at Mar. 31, 2022		11,553
Balance at Mar. 31, 2022	$ 216,024	$ 12	12,834	127	203,051	0
Balance (in shares) at Dec. 31, 2022	10,928	10,928
Balance at Dec. 31, 2022	$ 155,044	$ 11	21,555	24	139,852	(6,398)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	39,968				39,968
Share-based compensation (in shares)		69
Share-based compensation	$ 606		606
Options exercised by directors (in shares)	4	4
Options exercised by directors	$ 105		105
Net shares repurchased for employee taxes (in shares)		(30)
Net shares repurchased for employee taxes	(3,236)		(3,236)
Treasury stock from stock repurchases	(3,602)					(3,602)
Treasury stock retired from stock repurchases (in shares)		(84)
Treasury stock retired from stock repurchases	0				(10,000)	10,000
Other comprehensive income	9			9
Cash dividends declared to stockholders	$ (17,994)				(17,994)
Balance (in shares) at Mar. 31, 2023	10,887	10,887
Balance at Mar. 31, 2023	$ 170,900	$ 11	$ 19,030	$ 33	$ 151,826	$ 0