CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Sales	$ 73,222	$ 79,173	$ 138,783	$ 150,576
Costs and expenses:
Cost of sales	61,051	65,368	116,183	122,500
Selling, general and administrative	9,496	10,421	18,285	20,478
Restructuring charge	245	0	382	0
Litigation charges	26	3,224	26	3,224
Loss on disposal of property, plant and equipment	41	0	110	0
Total costs and expenses	70,859	79,013	134,986	146,202
Income from operations	2,363	160	3,797	4,374
Impairment of investment	(478)	0	(478)	0
Gain on sale of investment	0	119	0	119
Interest income and other, net	77	93	153	161
Earnings before provision for income taxes	1,962	372	3,472	4,654
Provision for income taxes	499	946	1,133	1,984
Net earnings (loss)	1,463	(574)	2,339	2,670
Class A [Member]
Costs and expenses:
Net earnings (loss)	246	(113)	389	453
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.11	$ (0.05)	$ 0.18	$ 0.21
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	2,174,912	2,174,912	2,174,912	2,174,912
Dividends paid per share:
Common share (in dollars per share)	$ 0.06	$ 0.06	$ 0.12	$ 0.12
Class B [Member]
Costs and expenses:
Net earnings (loss)	$ 1,217	$ (461)	$ 1,950	$ 2,217
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.13	$ (0.05)	$ 0.20	$ 0.23
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	9,677,141	9,582,610	9,654,473	9,554,354
Dividends paid per share:
Common share (in dollars per share)	$ 0.07	$ 0.07	$ 0.14	$ 0.14