Consolidated Statements Of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 05, 2015	Jun. 29, 2014	Jul. 05, 2015	Jun. 29, 2014
Consolidated Statements Of Comprehensive Income [Abstract]
Net sales	$ 102,371	$ 88,312	$ 203,370	$ 174,866
Cost of sales	81,938	72,170	162,058	143,004
Gross profit	20,433	16,142	41,312	31,862
Selling and general expenses	5,782	6,440	11,943	12,735
Intangibles amortization	888	3,381	3,282	5,824
Operating profit	13,763	6,321	26,087	13,303
Other income	101	148	176	312
Earnings before provision for income taxes	13,864	6,469	26,263	13,615
Provision for income taxes	4,744	2,298	9,034	4,754
Net earnings	$ 9,120	$ 4,171	$ 17,229	$ 8,861
Weighted average common shares outstanding:
Basic and diluted	6,951	6,929	6,947	6,925
Net earnings per share:
Basic and diluted	$ 1.31	$ 0.60	$ 2.48	$ 1.28
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	$ (1)	$ (1)	$ 6	$ 3
Comprehensive income	$ 9,119	$ 4,170	$ 17,235	$ 8,864
Cash dividends declared and paid per common share	$ 0.00	$ 0.00	$ 4.05	$ 5.05