Quarterly report pursuant to Section 13 or 15(d)

Acquisition (Details)

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Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 14, 2010
Acquisition (Textual) [Abstract]          
Received from seller due to reduction in purchase price       $ 384  
Energy Steel and Supply Co [Member]
          
Acquisition (Textual) [Abstract]          
Accounting and purchase price         17,899
Purchase agreement included a contingent earn-out, minimum         0
Purchase agreement included a contingent earn-out, maximum         2,000
Earn-out was paid   1,000      
Liability for remaining contingent earn-out 975   975    
Received from seller due to reduction in purchase price       384  
Energy Steel and Supply Co [Member] | Selling, General and Administrative Expenses [Member]
          
Acquisition (Textual) [Abstract]          
Liability for remaining contingent earn-out $ 975   $ 975