Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 52,479	$ 70,997	$ 110,973	$ 131,268
Cost of products sold	50,542	61,891	104,127	114,792
Gross margin	1,937	9,106	6,846	16,476
Selling, general and administrative expenses	5,397	5,604	11,305	10,570
Operating (loss) income	(3,460)	3,502	(4,459)	5,906
Interest expense and other financing costs	807	1,022	1,759	1,935
Other expense (income), net	3	10	(14)	31
(Loss) income before income taxes	(4,270)	2,470	(6,204)	3,940
(Benefit) provision for income taxes	(939)	384	(1,462)	632
Net (loss) income	$ (3,331)	$ 2,086	$ (4,742)	$ 3,308
Net (loss) income per common share - Basic	$ (0.38)	$ 0.24	$ (0.54)	$ 0.38
Net (loss) income per common share - Diluted	$ (0.38)	$ 0.24	$ (0.54)	$ 0.37
Weighted average shares of common stock outstanding
Basic	8,810,396	8,773,263	8,805,866	8,769,242
Diluted	8,810,396	8,847,827	8,805,866	8,860,143