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Note 15 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 463,124	$ 354,380
Depreciation and amortization	5,235	4,913
Operating income (loss)	31,590	3,051
Other income (loss), net	(10)	(17)
Income before interest and income taxes	31,580	3,034
Interest and other expense on debt	1,655	2,239
Income before income taxes	29,925	795
Specialty Metals Flat Products [Member]
Net sales	126,320	88,488
Depreciation and amortization	903	497
Operating income (loss)	8,022	2,735
Carbon Flat Products [Member]
Net sales	246,373	202,967
Depreciation and amortization	2,923	3,010
Operating income (loss)	21,200	(1,346)
Tubular and Pipe Products [Member]
Net sales	90,431	62,925
Depreciation and amortization	1,391	1,364
Operating income (loss)	6,320	4,305
Corporate Segment [Member]
Depreciation and amortization	18	42
Operating income (loss)	$ (3,952)	$ (2,643)

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