CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Sales	$ 156,341	$ 101,164	$ 338,426	$ 258,173
Costs and expenses:
Cost of sales	128,250	81,132	278,319	213,781
Selling, general and administrative	23,110	12,300	47,475	35,041
Restructuring charges	309	0	1,365	1,387
Total costs and expenses	151,669	93,432	327,159	250,209
Income from operations	4,672	7,732	11,267	7,964
Gain on sale of investment	0	98	0	98
Interest expense	(1,869)	(67)	(2,124)	(75)
Interest income and other, net	21	81	121	188
Earnings before provision (benefit) for income taxes	2,824	7,844	9,264	8,175
Provision (benefit) for income taxes	1,317	464	2,189	(336)
Net earnings	1,507	7,380	7,075	8,511
Class A [Member]
Costs and expenses:
Net earnings	255	1,340	1,238	1,528
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.12	$ 0.62	$ 0.57	$ 0.70
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	$ 0.18	$ 0.18
Class B [Member]
Costs and expenses:
Net earnings	$ 1,252	$ 6,040	$ 5,837	$ 6,983
Earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.13	$ 0.65	$ 0.62	$ 0.76
Weighted-average shares outstanding:
Common share - basic and diluted (in shares)	9,590,586	9,228,731	9,420,111	9,221,032
Dividends paid per share:
Common share (in dollars per share)	$ 0.07	$ 0.07	$ 0.21	$ 0.21