Note 15 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 354,380	$ 445,919
Depreciation and amortization	4,913	4,750
Operating income	3,051	6,074
Other income (loss), net	(17)	14
Income before interest and income taxes	3,034	6,088
Interest and other expense on debt	2,239	3,242
Income before income taxes	795	2,846
Carbon Flat Products [Member]
Net sales	202,967	278,536
Depreciation and amortization	3,010	2,814
Operating income	(1,346)	1,226
Specialty Metals Flat Products [Member]
Net sales	88,488	88,097
Depreciation and amortization	497	526
Operating income	2,735	2,244
Tubular and Pipe Products [Member]
Net sales	62,925	79,286
Depreciation and amortization	1,364	1,368
Operating income	4,305	5,615
Corporate Segment [Member]
Depreciation and amortization	42	42
Operating income	$ (2,643)	$ (3,011)