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Commitments and Contingencies (Details) (USD $)
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Aug. 31, 2012
Commitments and Contingencies      
Lease expense related to noncancellable operating leases $ 202,000 $ 200,000  
Future noncancellable minimum rental payments      
Remainder of 2013 669,000    
2014 867,000    
2015 945,000    
2016 888,000    
2017 272,000    
Thereafter 246,000    
Total 3,887,000    
Purchase Obligations      
Purchase commitments for property, plant and equipment $ 3,700,000   $ 3,700,000