Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Operations
Net sales	$ 222,356,000	$ 284,290,000	$ 269,485,000
Total cost of sales	187,882,000	262,784,000	242,344,000
Gross margin	34,474,000	21,506,000	27,141,000
Selling, general and administrative expense	24,084,000	28,934,000	27,838,000
Goodwill impairment	0	4,100,000	2,403,000
Total expenses	24,084,000	33,034,000	30,241,000
Operating income (loss)	10,390,000	(11,528,000)	(3,100,000)
Other income and expense
Net periodic post-retirement benefit	(80,000)	(94,000)	(48,000)
Net interest expense	5,923,000	4,144,000	2,394,000
Total other income and expense	5,843,000	4,050,000	2,346,000
Income (loss) before income taxes	4,547,000	(15,578,000)	(5,446,000)
Income taxes:
Current	(5,713,000)	705,000	1,048,000
Deferred	2,095,000	(1,060,000)	(1,712,000)
Total income taxes	(3,618,000)	(355,000)	(664,000)
Net income (loss)	$ 8,165,000	$ (15,223,000)	$ (4,782,000)
Net income (loss) per common share:
Basic	$ 0.98	$ (1.94)	$ (0.62)
Diluted	$ 0.98	$ (1.94)	$ (0.62)