Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2019	7,006,000
Balance at Dec. 31, 2019	$ 7,441	$ 11,447	$ 362,842	$ 136	$ (13,909)	$ 367,957
Net earnings			46,958			46,958
Unrealized gain on available-for-sale securities, net of tax				18		18
Dividends			(42,172)			(42,172)
Other (in shares)	19,000
Other		991	(1)		597	1,587
Unrealized loss on available-for-sale securities, net of tax				18		18
Balance (in shares) at Dec. 31, 2020	7,025,000
Balance at Dec. 31, 2020	$ 7,441	12,438	367,627	154	(13,312)	374,348
Net earnings			25,654			25,654
Unrealized gain on available-for-sale securities, net of tax				(134)		(134)
Dividends			(44,083)			(44,083)
Other (in shares)	17,000
Other		1,305	0		533	1,838
Unrealized loss on available-for-sale securities, net of tax				(134)		$ (134)
Balance (in shares) at Dec. 31, 2021	7,042,000					7,042,274
Balance at Dec. 31, 2021	$ 7,441	13,743	349,198	20	(12,779)	$ 357,623
Net earnings			20,699			20,699
Unrealized gain on available-for-sale securities, net of tax				(123)		(123)
Dividends			(31,826)			(31,826)
Other (in shares)	21,000
Other		1,056			623	1,679
Unrealized loss on available-for-sale securities, net of tax				(123)		$ (123)
Balance (in shares) at Dec. 31, 2022	7,063,000					7,062,872
Balance at Dec. 31, 2022	$ 7,441	$ 14,799	$ 338,071	$ (103)	$ (12,156)	$ 348,052