Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 66,071	$ 52,607	$ 129,808	$ 101,482
Cost of products sold	54,376	45,441	108,841	90,071
Gross margin	11,695	7,166	20,967	11,411
Selling, general and administrative expenses	5,849	4,499	11,056	9,228
Operating income (loss)	5,846	2,667	9,911	2,183
Interest expense and other financing costs	1,268	1,084	2,474	2,087
Other (income) expense, net	(599)	(14)	(642)	(20)
Income (loss) before income taxes	5,177	1,597	8,079	116
Provision (benefit) for income taxes	1,139	369	1,916	107
Net income (loss)	$ 4,038	$ 1,228	$ 6,163	$ 9
Net income (loss) per common share - Basic	$ 0.52	$ 0.17	$ 0.82	$ 0.00
Net income (loss) per common share - Diluted	$ 0.50	$ 0.17	$ 0.79	$ 0.00
Weighted average shares of common stock outstanding
Basic	7,817,628	7,219,423	7,541,332	7,217,943
Diluted	8,076,108	7,360,137	7,784,403	7,333,106