Consolidated Statements Of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ 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
Balance at Dec. 31, 2021	$ 7,441	$ 13,743	$ 349,198	$ 20	$ (12,779)	$ 357,623
Net earnings			2,915			2,915
Unrealized loss on available-for-sale securities, net of tax				(62)		(62)
Dividends			(31,827)			(31,827)
Other (in shares)	12
Other		413	0		329	742
Unrealized gain on available-for-sale securities, net of tax				(62)		(62)
Balance (in shares) at Apr. 03, 2022	7,054
Balance at Apr. 03, 2022	$ 7,441	14,156	320,286	(42)	(12,450)	329,391
Balance (in shares) at Dec. 31, 2022	7,063
Balance at Dec. 31, 2022	$ 7,441	14,799	338,071	(103)	(12,156)	348,052
Net earnings			8,878			8,878
Unrealized loss on available-for-sale securities, net of tax				15		15
Dividends			(28,385)			(28,385)
Other (in shares)	13
Other		509	0		413	922
Unrealized gain on available-for-sale securities, net of tax				15		15
Balance (in shares) at Apr. 02, 2023	7,076
Balance at Apr. 02, 2023	$ 7,441	$ 15,308	$ 318,564	$ (88)	$ (11,743)	$ 329,482