Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 28, 2014		Sep. 29, 2013		Sep. 28, 2014		Sep. 29, 2013
Consolidated Statements Of Comprehensive Income [Abstract]
Net sales	$ 95,463		$ 100,612		$ 270,329		$ 285,198
Cost of sales	79,298		80,962		222,302		230,928
Gross profit	16,165		19,650		48,027		54,270
Selling and general expenses	5,625		5,627		18,360		16,737
Intangibles amortization	2,692		167		8,516		500
Operating profit	7,848		13,856		21,151		37,033
Other income	41		153		353		508
Earnings before provision for income taxes	7,889		14,009		21,504		37,541
Income tax provision	2,766		4,994		7,520		13,371
Net earnings	5,123		9,015		13,984		24,170
Weighted average common shares outstanding:
Weighted average shares outstanding (basic and diluted)	6,932		6,907		6,927		6,905
Net earnings per share:
Basic and diluted	$ 0.74		$ 1.31		$ 2.02		$ 3.50
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	(3)		(7)				(27)
Comprehensive income	$ 5,120		$ 9,008		$ 13,984		$ 24,143
Cash dividends declared and paid per common share	$ 0.00	[1]	$ 0.00	[1]	$ 5.05	[1]	$ 0.00	[1]

[1] An accelerated payment was made in late December 2012 of the annual 2013 dividend. The acceleration was occasioned by the uncertainty over the federal income tax rates that would be in effect for 2013. In contrast, the annual 2014 dividend payment was made during the first quarter of 2014.