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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Net sales $ 307,483 $ 222,356 $ 284,290
Total cost of sales 266,139 187,882 262,784
Gross margin 41,344 34,474 21,506
Selling, general and administrative expense 30,276 24,084 28,934
Goodwill impairment 0 0 4,100
Total expenses 30,276 24,084 33,034
Operating income (loss) 11,068 10,390 (11,528)
Other income and expense      
Net periodic post-retirement benefit (162) (80) (94)
Net interest expense 2,311 5,923 4,144
Total other income and expense 2,149 5,843 4,050
Income (loss) before income taxes 8,919 4,547 (15,578)
Income taxes:      
Current 4,615 (5,713) 705
Deferred (367) 2,095 (1,060)
Total income taxes 4,248 (3,618) (355)
Net income (loss) $ 4,671 $ 8,165 $ (15,223)
Net income (loss) per common share:      
Basic (in USD per share) $ 0.55 $ 0.98 $ (1.94)
Diluted (in USD per share) $ 0.55 $ 0.98 $ (1.94)