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Note 10 - Stock-based Compensation (Details Textual) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2019 | Jun. 03, 2019 | Mar. 01, 2019 shares | Sep. 01, 2018 shares | Mar. 01, 2018 shares | Sep. 01, 2017 shares | Aug. 31, 2019 USD ($) $ / shares shares | Aug. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  | 141,767 | 94,504
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  | 2,462 | 1,748 | 1,970 | 1,780 |  |
Stock or Unit Option Plan Expense | $ |  |  |  |  |  |  | $ 1,431,925 | $ 413,010
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year | $ |  |  |  |  |  |  | $ 65,270 |
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 | $ / shares |  |  |  |  |  |  | $ 9.02 | $ 3.88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  | 5 years 328 days | 5 years 21 days
The 2019 Plan [member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 800,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  | 0 |
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 |  |  |  |  |  |  | 3 years |
ESPP [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 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 |  |  |  |  |  |  | 91,044 |

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- Definition Estimated expense to be recognized for the next fiscal year following the most recent fiscal year arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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