CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 63,028	$ 65,561
Costs and expenses:
Cost of sales	53,922	55,132
Selling, general and administrative	10,402	8,858
Restructuring charge	124	137
Total costs and expenses	64,448	64,127
(Loss) income from operations	(1,420)	1,434
Interest expense	(3)	0
Interest income and other, net	40	76
(Loss) earnings before (benefit) provision for income taxes	(1,383)	1,510
(Benefit) provision for income taxes	(830)	634
Net (loss) earnings	(553)	876
Class A [Member]
Costs and expenses:
Net (loss) earnings	(111)	143
(Loss) earnings per share:
Common share - basic and diluted (in dollars per share)	$ (0.05)	$ 0.07
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	2,174,912	2,174,912
Dividends paid per share:
Common share (in dollars per share)	$ 0.06	$ 0.06
Class B [Member]
Costs and expenses:
Net (loss) earnings	$ (442)	$ 733
(Loss) earnings per share:
Common share - basic and diluted (in dollars per share)	$ (0.05)	$ 0.08
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	9,221,104	9,631,805
Dividends paid per share:
Common share (in dollars per share)	$ 0.07	$ 0.07