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Note 17 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net sales | $ 331,547 |  | $ 299,921 |  | $ 248,296 |  | $ 354,380 |  | $ 319,740 |  | $ 384,230 |  | $ 429,151 |  | $ 445,919 |  | $ 1,234,144 |  | $ 1,579,040 |  | $ 1,715,081
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,490 |  | 19,030 |  | 17,608
Operating income (loss) (a) | $ 5,370 | [1] | $ (363) | [1] | $ (7,485) | [1] | $ 3,051 | [1] | $ 1,015 | [2] | $ 3,581 | [2] | $ 5,940 | [2] | $ 6,074 | [2] | 573 | [1] | 16,610 | [2] | 57,052
Other loss, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73) |  | (32) |  | (307)
Income before interest and income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  | 16,578 |  | 56,745
Interest and other expense on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,411 |  | 11,289 |  | 10,681
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,911) |  | 5,289 |  | 46,064
Carbon Flat Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 690,273 |  | 926,903 |  | 1,073,292
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,941 |  | 11,624 |  | 10,621
Operating income (loss) (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,289) |  | (5,023) |  | 44,354
Specialty Metals Flat Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 313,190 |  | 363,634 |  | 343,479
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,951 |  | 1,830 |  | 1,251
Operating income (loss) (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,666 |  | 14,321 |  | 15,248
Tubular and Pipe Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230,681 |  | 288,503 |  | 298,310
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,478 |  | 5,408 |  | 5,601
Operating income (loss) (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,019 |  | 18,607 |  | 11,520
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 |  | 168 |  | 135
Operating income (loss) (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (9,823) |  | $ (11,295) |  | $ (14,070)
[1] | Operating income (loss) in 2020 includes $1,517 of LIFO income related to the Company's tubular and pipe products segment.
[2] | Operating income (loss) in 2019 includes $3,669 of LIFO income related to the Company's tubular and pipe products segment.

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