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Significant Accounting Policies - Additional Information (Details)
12 Months Ended
Aug. 31, 2020
USD ($)
¥ / shares
shares
Aug. 31, 2020
USD ($)
$ / shares
shares
Aug. 31, 2019
USD ($)
¥ / shares
shares
Aug. 31, 2019
USD ($)
$ / shares
shares
Significant Accounting Policies [Line Items]        
Allowance for Doubtful Accounts Receivable $ 174,000 $ 174,000 $ 169,000 $ 169,000
Inventory Valuation Reserves 1,764,000 $ 1,764,000 1,290,000 $ 1,290,000
Percentage of Revenue Per Entity, Maximum   10.00%   10.00%
Fair Value Estimate Not Practicable Securities Sold Not Yet Purchasess 2,916,000 $ 2,916,000 655,000 $ 655,000
Restricted Cash and Cash Equivalents, Current $ 2,916,000 2,916,000 $ 655,000 655,000
Shipping Handling And Transportation Cost   4,087,000   4,083,000
Advertising Expense   $ 486,000   $ 392,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   40,000   40,000
Convertible Preferred Stock, Shares Issued upon Conversion | shares 36,000 36,000 36,000 36,000
Exchange Rate On Foreign Currency Translation And Transactions | (per share) $ 0.74 $ 0.77 $ 0.75 $ 0.75
Concentration Risk, Percentage   10.00%   9.00%
Operating Lease, Right-of-Use Asset $ 11,512,000 $ 11,512,000    
Maximum percentage of freight revenues   1.00%   1.00%
Accounting Standards Update 2016-02 | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Operating Lease, Right-of-Use Asset 11,500,000 $ 11,500,000    
Operating Lease, Liability $ 11,600,000 $ 11,600,000    
Canada        
Significant Accounting Policies [Line Items]        
Percentage of Total Assets Held Outside of Countries 4.00% 4.00% 4.00% 4.00%
Accounts Receivable        
Significant Accounting Policies [Line Items]        
Concentration Risk, Percentage       12.00%
Building        
Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   35 years    
Furniture, Fixtures And Equipment | Minimum        
Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   5 years    
Furniture, Fixtures And Equipment | Maximum        
Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   7 years