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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Net sales $ 101,606 $ 81,025 $ 290,933 $ 234,315
Cost of sales 88,303 74,610 250,015 201,446
Gross margin 13,303 6,415 40,918 32,869
Selling, general and administrative expense 8,671 8,808 25,889 23,744
Operating income (loss) 4,632 (2,393) 15,029 9,125
Other income and expense        
Loss from extinguishment of debt 1,582 0 1,582 0
Interest expense 511 563 1,511 1,725
Net periodic post-retirement benefit (31) (40) (93) (120)
Total other expense 2,062 523 3,000 1,605
Income (loss) before taxes 2,570 (2,916) 12,029 7,520
Income tax expense 1,251 396 4,658 3,290
Net income (loss) $ 1,319 $ (3,312) $ 7,371 $ 4,230
Net income (loss) per common share:        
Basic (in USD per share) $ 0.16 $ (0.41) $ 0.87 $ 0.50
Diluted (in USD per share) $ 0.16 $ (0.41) $ 0.87 $ 0.50