Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 70,997	$ 66,071	$ 131,268	$ 129,808
Cost of products sold	61,891	54,376	114,792	108,841
Gross margin	9,106	11,695	16,476	20,967
Selling, general and administrative expenses	5,604	5,849	10,570	11,056
Operating income	3,502	5,846	5,906	9,911
Interest expense and other financing costs	1,022	1,268	1,935	2,474
Other expense (income), net	10	(599)	31	(642)
Income before income taxes	2,470	5,177	3,940	8,079
Provision for income taxes	384	1,139	632	1,916
Net income	$ 2,086	$ 4,038	$ 3,308	$ 6,163
Net income per common share - Basic	$ 0.24	$ 0.52	$ 0.38	$ 0.82
Net income per common share - Diluted	$ 0.24	$ 0.50	$ 0.37	$ 0.79
Weighted average shares of common stock outstanding
Basic	8,773,263	7,817,628	8,769,242	7,541,332
Diluted	8,847,827	8,076,108	8,860,143	7,784,403