Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common [Member]	Total
Balance (in shares) at Dec. 31, 2021	7,042,000
Balance at Dec. 31, 2021	$ 7,441	$ 13,743	$ 349,198	$ 20	$ (12,779)	$ 357,623
Net earnings			20,699			20,699
Unrealized loss on available-for-sale securities, net of tax				(123)		(123)
Dividends paid March 15, $1.00 per share regular, $3.50 per share extra			(31,826)			(31,826)
Other (in shares)	21,000
Other		1,056	0		623	1,679
Unrealized gain on available-for-sale securities, net of tax				(123)		(123)
Balance (in shares) at Dec. 31, 2022	7,063,000
Balance at Dec. 31, 2022	$ 7,441	14,799	338,071	(103)	(12,156)	348,052
Net earnings			34,559			34,559
Unrealized loss on available-for-sale securities, net of tax				125		125
Dividends paid March 15, $1.00 per share regular, $3.50 per share extra			(28,385)			(28,385)
Other (in shares)	19,000
Other		1,232	0		673	1,905
Unrealized gain on available-for-sale securities, net of tax				125		$ 125
Balance (in shares) at Dec. 31, 2023	7,082,000					7,084,384
Balance at Dec. 31, 2023	$ 7,441	16,031	344,245	22	(11,483)	$ 356,256
Net earnings			41,460			41,460
Unrealized loss on available-for-sale securities, net of tax				13		13
Dividends paid March 15, $1.00 per share regular, $3.50 per share extra			(32,029)			(32,029)
Other (in shares)	21,000
Other		1,267	(17)		677	1,927
Unrealized gain on available-for-sale securities, net of tax				13		$ 13
Balance (in shares) at Dec. 31, 2024	7,103,000					7,105,595
Balance at Dec. 31, 2024	$ 7,441	$ 17,298	$ 353,659	$ 35	$ (10,806)	$ 367,627