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			18,526			18,526
Unrealized loss on available-for-sale securities, net of tax				(176)		(176)
Other (in shares)	18
Other		842	0		537	1,379
Dividends			(31,827)			(31,827)
Unrealized gain on available-for-sale securities, net of tax				(176)		(176)
Balance (in shares) at Oct. 02, 2022	7,060
Balance at Oct. 02, 2022	$ 7,441	14,585	335,897	(156)	(12,242)	345,525
Balance (in shares) at Jul. 03, 2022	7,057
Balance at Jul. 03, 2022	$ 7,441	14,374	326,970	(67)	(12,346)	336,372
Net earnings			8,927			8,927
Unrealized loss on available-for-sale securities, net of tax				(89)		(89)
Other (in shares)	3
Other		211	0		104	315
Unrealized gain on available-for-sale securities, net of tax				(89)		(89)
Balance (in shares) at Oct. 02, 2022	7,060
Balance at Oct. 02, 2022	$ 7,441	14,585	335,897	(156)	(12,242)	345,525
Balance (in shares) at Dec. 31, 2022	7,063
Balance at Dec. 31, 2022	$ 7,441	14,798	338,072	(103)	(12,156)	348,052
Net earnings			21,400			21,400
Unrealized loss on available-for-sale securities, net of tax				28		28
Other (in shares)	19
Other		990	0		597	1,587
Dividends			(28,385)			(28,385)
Unrealized gain on available-for-sale securities, net of tax				28		28
Balance (in shares) at Oct. 01, 2023	7,082
Balance at Oct. 01, 2023	$ 7,441	15,788	331,087	(75)	(11,559)	342,682
Balance (in shares) at Jul. 02, 2023	7,079
Balance at Jul. 02, 2023	$ 7,441	15,540	324,068	(95)	(11,658)	335,296
Net earnings			7,019			7,019
Unrealized loss on available-for-sale securities, net of tax				20		20
Other (in shares)	3
Other		248	0		99	347
Unrealized gain on available-for-sale securities, net of tax				20		20
Balance (in shares) at Oct. 01, 2023	7,082
Balance at Oct. 01, 2023	$ 7,441	$ 15,788	$ 331,087	$ (75)	$ (11,559)	$ 342,682