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Note 10 - Stock-based Compensation (Details Textual) - USD ($) |  | 9 Months Ended
--- | --- | ---
Jan. 15, 2021 | May 31, 2021 | May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 419,874 | 300,770
Share-based Payment Arrangement, Expense |  | $ 503,339 | $ 998,122
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | 827,502 |
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year |  | 160,835 |
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two |  | 333,333 |
Allocated Share Based Compensation Expense, Estimate, Fiscal Year Three |  | $ 333,334 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 3.12 | $ 4.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  | 6 years 4 months 24 days | 6 years 3 months 7 days
The 2019 Plan [member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 800,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 1,600,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 720,644 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  | 879,356 |
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 |
The 2007 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 783,652 |

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- Definition Estimated expense to be recognized for the third 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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- Definition Estimated expense to be recognized for the second 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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- Definition Estimated expense to be recognized for the remainder of the 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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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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