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Income Taxes (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Income Taxes        
Change in beginning of the year valuation allowance as a result of changes in estimates $ 600,000 $ 0 $ 584,000 $ (1,163,000)
Net Operating Loss Carryforwards        
Total unused net operating loss carryforwards and income tax credits   38,266,000    
Reconciliation of the beginning and ending balances of the unrecognized tax benefits        
Unrecognized benefit - beginning of year   330,000 252,000 119,000
Gross increases - current year tax positions       89,000
Gross increases - prior years tax positions     78,000 44,000
Settlements of prior year's tax positions   (185,000)    
Unrecognized benefit - end of year 330,000 145,000 330,000 252,000
U.S. Federal
        
Net Operating Loss Carryforwards        
Net operating loss carryforwards   6,976,000    
State
        
Net Operating Loss Carryforwards        
Net operating loss carryforwards   489,000    
Foreign
        
Net Operating Loss Carryforwards        
Net operating loss carryforwards (expiring over the next 5 years)   2,224,000    
Net operating loss carryforwards (expiring in more than 5 years)   26,665,000    
Income tax credit carryovers   $ 1,912,000