Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 69,056	$ 50,887	$ 198,864	$ 152,369
Cost of products sold	58,631	45,423	167,472	135,494
Gross margin	10,425	5,464	31,392	16,875
Selling, general and administrative expenses	5,131	4,448	16,187	13,676
Operating income (loss)	5,294	1,016	15,205	3,199
Interest expense and other financing costs	966	1,122	3,440	3,209
Other (income) expense, net	(48)	(23)	(690)	(43)
Income (loss) before income taxes	4,376	(83)	12,455	33
Provision (benefit) for income taxes	460	176	2,376	283
Net income (loss)	$ 3,916	$ (259)	$ 10,079	$ (250)
Net income (loss) per common share - Basic	$ 0.45	$ (0.04)	$ 1.27	$ (0.03)
Net income (loss) per common share - Diluted	$ 0.44	$ (0.04)	$ 1.23	$ (0.03)
Weighted average shares of common stock outstanding
Basic	8,699,953	7,228,277	7,931,783	7,221,426
Diluted	8,952,749	7,228,277	8,166,759	7,221,426