Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 255,927	$ 202,643	$ 154,434
Cost of products sold	218,111	179,609	140,921
Gross margin	37,816	23,034	13,513
Selling, general and administrative expenses	21,746	18,797	17,482
Operating income (loss)	16,070	4,237	(3,969)
Interest expense and other financing costs	4,302	4,277	4,674
Other (income) expense	(829)	(49)	230
Income (loss) before income taxes	12,597	9	(8,873)
Provision (benefit) for income taxes	1,935	(7,601)	(3,526)
Net income (loss)	$ 10,662	$ 7,610	$ (5,347)
Basic earnings (loss) per share	$ 1.31	$ 1.05	$ (0.74)
Diluted earnings (loss) per share	$ 1.28	$ 1.03	$ (0.74)
Weighted average shares of common stock outstanding
Basic	8,132,632	7,225,697	7,193,300
Diluted	8,347,692	7,374,805	7,193,300