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Note 15 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Undistributed Earnings of Foreign Subsidiaries $ 17,960,860 $ 17,779,912
Deferred Income Tax Expense (Benefit) (116,000) (41,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0 0
Capital Loss Carryforward [Member]    
Deferred Tax Assets, Capital Loss Carryforwards 618,000  
Foreign Tax Authority [Member]    
Tax Credit Carryforward, Valuation Allowance 6,105,700 5,679,000
Operating Loss Carryforwards, Valuation Allowance 618,000 571,000
Federal and State Tax [Member]    
Tax Credit Carryforward, Valuation Allowance 2,855,100 2,643,300
Operating Loss Carryforwards $ 2,855,100  
Deferred Tax Expenses Related to Undistributed Earnings of Foreign Joint Ventures [Member]    
Deferred Income Tax Expense (Benefit)   $ 3,000