CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net Sales	$ 65,561	$ 71,403
Costs and expenses:
Cost of sales	55,132	57,132
Selling, general and administrative	8,789	10,057
Restructuring charge	137	0
Loss on disposal of property, plant and equipment	69	0
Total costs and expenses	64,127	67,189
Income from operations	1,434	4,214
Interest income and other, net	76	68
Earnings before provision for income taxes	1,510	4,282
Provision for income taxes	634	1,038
Net earnings	$ 876	$ 3,244
Class A [Member]
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.07	$ 0.26
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]
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.08	$ 0.28
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	9,631,805	9,525,785
Dividends paid per share:
Common share (in dollars per share)	$ 0.07	$ 0.07