Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Net sales	$ 87,225	$ 93,937	$ 255,370	$ 246,705
Cost of sales	75,995	73,219	208,104	188,127
Gross profit	11,230	20,718	47,266	58,578
Selling and general expenses	6,541	6,212	20,196	19,366
Intangibles amortization	54	54	162	168
Operating profit	4,635	14,452	26,908	39,044
Other income	645	812	1,910	3,032
Earnings before provision for income taxes	5,280	15,264	28,818	42,076
Provision for income taxes	1,151	3,126	6,404	9,059
Net earnings	$ 4,129	$ 12,138	$ 22,414	$ 33,017
Weighted average shares outstanding:
Basic and diluted (in shares)	7,062	7,041	7,059	7,036
us-gaap_EarningsPerShareAbstract
Basic and diluted (in dollars per share)	$ 0.58	$ 1.72	$ 3.18	$ 4.69
Comprehensive income:
Net earnings	$ 4,129	$ 12,138	$ 22,414	$ 33,017
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on available-for-sale securities	(22)	(64)	(105)	94
Comprehensive income	$ 4,107	$ 12,074	$ 22,309	$ 33,111
Cash dividends declared and paid per common share (in dollars per share)	$ 0.00	$ 0.00	$ 6.25	$ 6.00