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Note 11 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net sales:    
Net sales $ 375,598 $ 334,893
Depreciation and amortization:    
Depreciation and amortization 4,246 4,536
Operating income (loss):    
Operating income 12,345 11,051
Other income (loss), net (46) (26)
Income before interest and income taxes 12,299 11,025
Interest and other expense on debt 1,986 1,626
Income before income taxes 10,313 9,399
Carbon Flat Products [Member]    
Net sales:    
Net sales 240,894 216,916
Depreciation and amortization:    
Depreciation and amortization 2,560 2,889
Operating income (loss):    
Operating income 8,106 7,375
Specialty Metals Flat Products [Member]    
Net sales:    
Net sales 65,529 57,955
Depreciation and amortization:    
Depreciation and amortization 204 226
Operating income (loss):    
Operating income 3,011 3,985
Tubular and Pipe Products [Member]    
Net sales:    
Net sales 69,175 60,022
Depreciation and amortization:    
Depreciation and amortization 1,456 1,396
Operating income (loss):    
Operating income 4,267 2,487
Corporate Segment [Member]    
Depreciation and amortization:    
Depreciation and amortization 26 25
Operating income (loss):    
Operating income $ (3,039) $ (2,796)