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Significant Accounting Policies and Significant Recent Accounting Pronouncements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Aug. 31, 2018
Significant Accounting Policies [Line Items]          
Allowance for Doubtful Accounts Receivable $ 111,000   $ 111,000   $ 111,000
Inventory Valuation Reserves $ 1,492,000   $ 1,492,000   1,376,000
Percentage of Revenue Per Entity, Maximum 10.00% 10.00% 10.00% 10.00%  
Restricted Cash and Cash Equivalents, Current $ 2,334,000   $ 2,334,000   $ 933,000 [1]
Exchange Rate On Foreign Currency Translation And Transactions $ 0.75 $ 0.78 $ 0.75 $ 0.79  
Sales Revenue, Net [Member]          
Significant Accounting Policies [Line Items]          
Concentration Risk, Percentage     9.00% 9.00%  
Accounts Receivable [Member]          
Significant Accounting Policies [Line Items]          
Concentration Risk, Percentage     10.00% 11.00%  
[1] Derived from the Company’s audited financial statements included in its Form 10-K for the year ended August 31, 2018 as filed with the U. S. Securities and Exchange Commission on November 28, 2018.