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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Tubular And Pipe Products [Member] | Goodwill [Member]        
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent   24.50%   26.20%
Tubular And Pipe Products [Member]        
Goodwill, Impairment Loss   $ 16,500   $ 16,500
Income Tax Expense (Benefit) $ 3,457 $ (3,635) $ 2,969 $ (2,953)
Effective Income Tax Rate Reconciliation, Percent 49.30% 14.00% 51.60% 12.20%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 700   $ 700  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent 9.40%   11.40%