CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Sales	$ 99,439	$ 93,981	$ 182,085	$ 157,009
Costs and expenses:
Cost of sales	81,493	78,717	150,069	132,649
Selling, general and administrative	13,176	12,342	24,365	22,741
Restructuring charge	1,056	1,263	1,056	1,387
Total costs and expenses	95,725	92,322	175,490	156,777
Income from operations	3,714	1,659	6,595	232
Interest expense	(225)	(5)	(255)	(8)
Interest income and other, net	49	69	100	107
Earnings before provision (benefit) for income taxes	3,538	1,723	6,440	331
Provision (benefit) for income taxes	473	34	872	(800)
Net earnings	3,065	1,689	5,568	1,131
Class A [Member]
Costs and expenses:
Net earnings	545	299	987	187
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.25	$ 0.14	$ 0.45	$ 0.09
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	$ 2,520	$ 1,390	$ 4,581	$ 944
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.27	$ 0.15	$ 0.49	$ 0.10
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	9,331,982	9,213,178	9,333,460	9,217,119
Dividends paid per share:
Common share (in dollars per share)	$ 0.07	$ 0.07	$ 0.14	$ 0.14