Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Net sales	$ 81,027	$ 65,636
Cost of sales	62,666	49,519
Gross profit	18,361	16,117
Selling and general expenses	7,364	6,794
Intangibles amortization	54	60
Operating profit	10,943	9,263
Other income	700	1,267
Earnings before provision for income taxes	11,643	10,530
Provision for income taxes	2,650	2,308
Net earnings	$ 8,993	$ 8,222
Weighted average shares outstanding:
Basic and diluted (in shares)	7,053	7,028
us-gaap_EarningsPerShareAbstract
Basic and diluted (in dollars per share)	$ 1.28	$ 1.17
Comprehensive income:
Net earnings	$ 8,993	$ 8,222
Other comprehensive income, net of tax:
Unrealized (loss) gain on available-for-sale securities	(49)	93
Comprehensive income	$ 8,944	$ 8,315
Cash dividends declared and paid per common share (in dollars per share)	$ 6.25	$ 6.00