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Note 12 - Segment Information (Detail) - Segment Reporting Information (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net sales    
Net sales $ 338,064 $ 382,052
Depreciation and amortization    
Depreciation and amortization 5,515 4,992
Operating income    
Operating income 9,581 12,263
Other income, net 23 34
Income before interest and income taxes 9,604 12,297
Interest and other expense on debt 1,698 2,108
Income before income taxes 7,906 10,189
Capital expenditures    
Capital expenditures 1,714 7,969
Flat Products [Member]
    
Net sales    
Net sales 275,747 316,629
Depreciation and amortization    
Depreciation and amortization 4,242 3,870
Operating income    
Operating income 4,805 7,794
Capital expenditures    
Capital expenditures 679 5,447
Tubular and Pipe Products [Member]
    
Net sales    
Net sales 62,317 65,423
Depreciation and amortization    
Depreciation and amortization 1,273 1,122
Operating income    
Operating income 6,759 6,444
Capital expenditures    
Capital expenditures 1,035 2,522
Corporate Expenses (Member)
    
Operating income    
Operating income $ (1,983) $ (1,975)