CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net Sales	$ 295,121	$ 302,539	$ 182,753
Costs and expenses:
Cost of sales	244,749	239,185	161,454
Selling, general and administrative	39,284	40,443	30,055
Restructuring charges	314	0	413
Litigation charges	3,471	8,103	0
Impairment of assets	0	0	12,875
Gain on disposal/sale of property, plant and equipment	(93)	(352)	(4,693)
Total costs and expenses	287,725	287,379	200,104
Income (loss) from operations	7,396	15,160	(17,351)
Gain on sale of investments	119	0	7,129
Interest income and other, net	357	420	527
Earnings (loss) before provision (benefit) for income taxes	7,872	15,580	(9,695)
Income tax provision (benefit)	4,108	1,931	(1,385)
Net earnings (loss)	$ 3,764	$ 13,649	$ (8,310)
Class A [Member]
Earnings (loss) per share:
Common share - basic and diluted (in dollars per share)	$ 0.28	$ 1.10	$ (0.71)
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	2,174,912	2,174,912	2,175,322
Dividends paid per share:
Common share (in dollars per share)	$ 0.24	$ 0.24	$ 0.24
Class B [Member]
Earnings (loss) per share:
Common share - basic and diluted (in dollars per share)	$ 0.33	$ 1.18	$ (0.72)
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	9,597,661	9,504,261	9,363,199
Dividends paid per share:
Common share (in dollars per share)	$ 0.28	$ 0.28	$ 0.28