Condensed Consolidated Statements of Income - Scenario, Unspecified [Domain] - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net sales	$ 134,486	$ 146,516	$ 302,739	$ 284,833
Cost of goods sold	128,808	139,501	289,885	271,331
Gross profit	5,678	7,015	12,854	13,502
Selling, general and administrative expenses	3,640	3,482	7,538	6,781
Operating income	2,038	3,533	5,316	6,721
Interest expense, net	1,571	1,091	3,246	2,182
Income before other expenses	467	2,442	2,070	4,539
Other expenses
Change in value of derivative liability	412	249	1,408	(180)
Income before income taxes	879	2,691	3,478	4,359
Income taxes	75	1,045	1,019	1,905
Net income	$ 804	$ 1,646	$ 2,459	$ 2,454
Weighted average shares outstanding:
Basic (in shares)	8,863	8,669	8,753	8,649
Diluted (in shares)	11,864	11,968	11,821	11,949
Earnings per share:
Basic (in dollars per share)	$ 0.09	$ 0.19	$ 0.28	$ 0.28
Diluted (in dollars per share)	$ 0.06	$ 0.15	$ 0.15	$ 0.26