Consolidated Statements Of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Consolidated Statements Of Comprehensive Income [Abstract]
Net sales	$ 93,078	$ 90,901	$ 267,560	$ 294,271
Cost of sales	74,614	71,780	212,899	233,838
Gross profit	18,464	19,121	54,661	60,433
Selling and general expenses	6,226	6,624	19,081	18,567
Intangibles amortization		356	568	3,638
Operating profit	12,238	12,141	35,012	38,228
Other income	223	236	591	412
Earnings before provision for income taxes	12,461	12,377	35,603	38,640
Provision for income taxes	4,157	4,266	11,814	13,300
Net earnings	$ 8,304	$ 8,111	$ 23,789	$ 25,340
Weighted average shares outstanding:
Basic and diluted	6,972	6,953	6,969	6,948
Net earnings per share:
Basic and diluted	$ 1.19	$ 1.17	$ 3.41	$ 3.65
Other comprehensive loss, net of tax:
Unrealized loss on available-for-sale securities	$ 29	$ 7	$ 11	$ 1
Comprehensive income	$ 8,275	$ 8,104	$ 23,778	$ 25,339
Cash dividends declared and paid per common share	$ 0.00	$ 0.00	$ 5.05	$ 4.05