Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net sales	$ 110,468	$ 145,692	$ 243,898	$ 291,301
Cost of goods sold	105,201	139,271	232,001	278,526
Gross profit	5,267	6,421	11,897	12,775
Selling, general and administrative expenses	3,501	3,307	6,759	6,759
Operating income	1,766	3,114	5,138	6,016
Other expenses
Change in value of derivative liability	(44)	195	(2,167)	(49)
Interest expense, net	(1,134)	(1,413)	(2,247)	(2,741)
Income before income taxes	588	1,896	724	3,226
Income taxes	221	728	272	1,227
Net income	$ 367	$ 1,168	$ 452	$ 1,999
Weighted average shares outstanding:
Basic (in shares)	8,586	9,230	8,585	9,205
Diluted (in shares)	8,871	12,117	8,860	12,096
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 0.04	$ 0.13	$ 0.05	$ 0.22
Diluted (in dollars per share)	$ 0.04	$ 0.11	$ 0.05	$ 0.21