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Note 9 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Tubular And Pipe Products [Member]          
Goodwill, Impairment Loss       $ 16,451,000  
Income Tax Expense (Benefit) $ (438,000) $ 939,000   $ (3,391,000) $ 4,471,000
Effective Income Tax Rate Reconciliation, Percent 42.30% 37.60%   13.50% 36.40%
Goodwill, Impairment Loss     $ 16,500,000 $ 16,451,000  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent       25.30%