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Schedule III - Supplemental Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Quarterly Financial Information [Table Text Block] |
2020 |  | 1st quarter |  |  | 2nd quarter |  |  | 3rd quarter |  |  | 4th quarter |  |  | Year |
Net sales |  | $ | 354,380 |  |  | $ | 248,296 |  |  | $ | 299,921 |  |  | $ | 331,547 |  |  | $ | 1,234,144 |
Operating income (loss) (a) |  |  | 3,051 |  |  |  | (7,485 | ) |  |  | (363 | ) |  |  | 5,370 |  |  |  | 573 |
Income (loss) before income taxes |  |  | 795 |  |  |  | (9,402 | ) |  |  | (2,081 | ) |  |  | 3,777 |  |  |  | (6,911 | )
Net income (loss) |  | $ | 593 |  |  | $ | (6,454 | ) |  | $ | (1,520 | ) |  | $ | 1,786 |  |  | $ | (5,595 | )
Basic net income (loss) per share |  | $ | 0.05 |  |  | $ | (0.56 | ) |  | $ | (0.13 | ) |  | $ | 0.16 |  |  | $ | (0.49 | )
Weighted average shares outstanding - basic |  |  | 11,444 |  |  |  | 11,446 |  |  |  | 11,452 |  |  |  | 11,451 |  |  |  | 11,447 |
Diluted net income (loss) per share |  | $ | 0.05 |  |  | $ | (0.56 | ) |  | $ | (0.13 | ) |  | $ | 0.16 |  |  | $ | (0.49 | )
Weighted average shares outstanding - diluted |  |  | 11,459 |  |  |  | 11,446 |  |  |  | 11,452 |  |  |  | 11,475 |  |  |  | 11,447 |
Market price of common stock: (b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 18.05 |  |  | $ | 13.95 |  |  | $ | 12.64 |  |  | $ | 16.49 |  |  | $ | 18.05 |
Low |  |  | 8.44 |  |  |  | 7.74 |  |  |  | 9.68 |  |  |  | 10.84 |  |  |  | 7.74 |
2019 |  | 1st quarter |  |  | 2nd quarter |  |  | 3rd quarter |  |  | 4th quarter |  |  | Year |
Net sales |  | $ | 445,919 |  |  | $ | 429,151 |  |  | $ | 384,230 |  |  | $ | 319,740 |  |  | $ | 1,579,040 |
Operating income (a) |  |  | 6,074 |  |  |  | 5,940 |  |  |  | 3,581 |  |  |  | 1,015 |  |  |  | 16,610 |
Income (loss) before income taxes |  |  | 2,846 |  |  |  | 2,707 |  |  |  | 1,024 |  |  |  | (1,288 | ) |  |  | 5,289 |
Net income (loss) |  | $ | 2,074 |  |  | $ | 2,081 |  |  | $ | 591 |  |  | $ | (890 | ) |  | $ | 3,856 |
Basic net income (loss) per share |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.05 |  |  | $ | (0.08 | ) |  | $ | 0.34 |
Weighted average shares outstanding - basic |  |  | 11,488 |  |  |  | 11,415 |  |  |  | 11,420 |  |  |  | 11,416 |  |  |  | 11,509 |
Diluted net income (loss) per share |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.05 |  |  | $ | (0.08 | ) |  | $ | 0.34 |
Weighted average shares outstanding - diluted |  |  | 11,488 |  |  |  | 11,415 |  |  |  | 11,420 |  |  |  | 11,416 |  |  |  | 11,509 |
Market price of common stock: (b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 20.24 |  |  | $ | 18.24 |  |  | $ | 16.28 |  |  | $ | 18.41 |  |  | $ | 20.24 |
Low |  |  | 14.00 |  |  |  | 12.09 |  |  |  | 9.99 |  |  |  | 13.53 |  |  |  | 9.99 |

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