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Note 10 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net sales    
Net sales $ 334,893 $ 258,349
Depreciation and amortization    
Depreciation and Amortization 4,536 4,731
Operating income (loss)    
Operating Income (loss) 11,051 35
Other income (loss), net (26) (5)
Income before interest and income taxes 11,025 30
Interest and other expense on debt 1,626 1,285
Income (loss) before income taxes 9,399 (1,255)
Carbon Flat Products [Member]    
Net sales    
Net sales 216,916 161,434
Depreciation and amortization    
Depreciation and Amortization 2,889 2,954
Operating income (loss)    
Operating Income (loss) 7,375 (2,178)
Specialty Metal Flat Products [Member]    
Net sales    
Net sales 57,955 45,830
Depreciation and amortization    
Depreciation and Amortization 226 193
Operating income (loss)    
Operating Income (loss) 3,985 1,756
Tubular And Pipe Products [Member]    
Net sales    
Net sales 60,022 51,085
Depreciation and amortization    
Depreciation and Amortization 1,396 1,559
Operating income (loss)    
Operating Income (loss) 2,487 2,243
Corporate Segment [Member]    
Depreciation and amortization    
Depreciation and Amortization 25 25
Operating income (loss)    
Operating Income (loss) $ (2,796) $ (1,786)