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Commitments and Contingencies (Details) (USD $)
3 Months Ended 12 Months Ended
May 31, 2012
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Commitments and Contingencies        
Outstanding deposits maintained for noncancellable operating leases   $ 168,000 $ 214,000  
Lease expense related to noncancellable operating leases   802,000 750,000 530,000
Future noncancellable minimum rental payments        
2013   845,000    
2014   837,000    
2015   912,000    
2016   861,000    
2017   264,000    
Thereafter   239,000    
Total   3,958,000    
Purchase Obligations        
Purchase commitments for property, plant and equipment   3,700,000 10,900,000  
Litigation        
Accrued liability recognized 1,500,000 1,500,000    
Cree
       
Litigation        
Accrued liability recognized $ 1,500,000