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Note 2 - Disposition of OCTG Business (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Disposal of OCTG Business [Member] | Subsequent Event [Member]                    
Escrow Deposit Released $ 4,300                  
Disposal of OCTG Business [Member]                    
Proceeds from Sale of Productive Assets     $ 42,700              
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax   $ 1,800     $ 1,400   $ (12,100)     $ (13,500)
Goodwill, Written off Related to Sale of Business Unit     4,400              
Business Acquisition Purchase Price Amount Held In Escrow To Secure Indemnification Obligations     4,300       4,300      
Repayments of Debt and Capital Lease Obligations     5,000              
Business Acquisition, Transaction Costs     $ 1,800       $ 1,800      
Proceeds from Divestiture of Businesses                   $ 29,800
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax                 $ (12,083)  
Proceeds from Divestiture of Businesses               $ 4,300 $ 31,609