Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Net sales	$ 87,118	$ 87,132	$ 168,145	$ 152,768
Cost of sales	69,443	65,389	132,109	114,908
Gross profit	17,675	21,743	36,036	37,860
Selling and general expenses	6,291	6,360	13,655	13,154
Intangibles amortization	54	54	108	114
Operating profit	11,330	15,329	22,273	24,592
Other income	565	953	1,265	2,220
Earnings before provision for income taxes	11,895	16,282	23,538	26,812
Provision for income taxes	2,603	3,625	5,253	5,933
Net earnings	$ 9,292	$ 12,657	$ 18,285	$ 20,879
Weighted average shares outstanding:
Basic and diluted (in shares)	7,060	7,038	7,057	7,034
us-gaap_EarningsPerShareAbstract
Basic and diluted (in dollars per share)	$ 1.32	$ 1.80	$ 2.59	$ 2.97
Comprehensive income:
Net earnings	$ 9,292	$ 12,657	$ 18,285	$ 20,879
Other comprehensive income, net of tax:
Unrealized (loss) gain on available-for-sale securities	(34)	65	(83)	158
Comprehensive income	$ 9,258	$ 12,722	$ 18,202	$ 21,037
Cash dividends declared and paid per common share (in dollars per share)	$ 0.00	$ 0.00	$ 6.25	$ 6.00