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Note 10 - Stock-based Compensation (Details Textual)
12 Months Ended 13 Months Ended
Mar. 01, 2020
shares
Sep. 01, 2019
shares
Jun. 28, 2019
Jun. 03, 2019
Mar. 01, 2019
shares
Sep. 01, 2018
shares
Aug. 31, 2020
USD ($)
$ / shares
shares
Aug. 31, 2019
USD ($)
$ / shares
shares
Oct. 01, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             300,770 141,767  
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 2,754 3,597     2,462 1,748      
Stock or Unit Option Plan Expense | $             $ 1,337,774 $ 1,431,925  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two | $             $ 20,834    
Stockholders' Equity Note, Stock Split, Conversion Ratio     2 2          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares             $ 9.63 $ 9.02  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)             6 years 7 days 5 years 328 days  
The 2019 Plan [member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)             800,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             300,770 141,767  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)             499,230    
The 2019 Plan [member] | One Year after Date of Grant [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             1 year    
The 2019 Plan [member] | One Year after Date of Grant [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             3 years    
ESPP [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent                 90.00%
Common Stock, Capital Shares Reserved for Future Issuance (in shares)             84,693