Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 61,360	$ 67,299	$ 203,840	$ 190,428
Cost of products sold	52,023	54,725	168,658	154,884
Selling and administrative expenses	4,685	5,343	13,531	12,870
Operating income	4,652	7,231	21,651	22,674
Interest expense	(602)	(609)	(1,924)	(852)
Other income	28	45	89	188
Income before income tax expense	4,078	6,667	19,816	22,010
Provision for income taxes	1,333	2,774	6,280	8,144
Net income	$ 2,745	$ 3,893	$ 13,536	$ 13,866
Net income per common share - Basic	$ 0.40	$ 0.57	$ 1.97	$ 2.03
Net income per common share - Diluted	$ 0.38	$ 0.55	$ 1.86	$ 1.97
Weighted average shares of Common Stock outstanding
Basic	6,877,915	6,831,048	6,863,564	6,821,944
Diluted	7,433,922	7,202,386	7,446,836	7,050,781