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Statements of Cash flows - Supplemental and Non-Cash Disclosures
3 Months Ended
Jun. 30, 2012
Statement Of Cash Flows Supplemental [Abstract]  
Cash Flow Supplemental Disclosures [Text Block]
        
  Nine months ended June 30, 
  2012 2011 
 Supplemental Disclosures      
 Cash paid for interest$ 589 $ 416 
 Cash paid for income taxes  23,050   14,436 
 Non-cash Activities      
 Issuance of restricted common stock for asset acquisition  7,158   - 
 Capital lease asset additions and related obligations  140   - 
 Equipment acquisitions financed with accounts payable  145   102