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Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Aug. 31, 2018
Significant Accounting Policies [Line Items]            
Allowance for Doubtful Accounts Receivable $ 111,000   $ 111,000     $ 111,000
Inventory Valuation Reserves $ 1,483,000   $ 1,483,000     1,376,000
Percentage of Revenue Per Entity, Maximum 10.00% 10.00% 10.00% 10.00%    
Restricted Cash and Cash Equivalents, Current $ 818,000   $ 818,000     $ 933,000 [1]
Exchange Rate On Foreign Currency Translation And Transactions     $ 0.75 $ 0.79 $ 0.80  
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     13.00% 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.