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Note 7 - Corporate Debt (Details Textual)
9 Months Ended
May 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Term Loan and Line of Credit, Agreements, Loan Agreements [Member]    
Debt Instrument, Covenants, Fixed Charge Coverage Ratio 1.1  
PNC Bank [Member]    
Letters of Credit Outstanding, Amount $ 0 $ 0
PNC Bank [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 3,000,000  
Long-term Line of Credit, Total $ 0 0
PNC Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.15%  
PNC Bank [Member] | Letter of Credit [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,200,000  
JP Morgan Chase Bank [Member]    
Letters of Credit Outstanding, Amount $ 88,831 $ 89,543