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Note 10 - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended
	Nov. 06, 2020	Nov. 30, 2020	Nov. 30, 2019
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		$ 181,669	$ 318,818
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		1,149,172
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year		482,505
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two		$ 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 10 months 24 days	6 years 9 months 10 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, 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)		79,356
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	800,000
The 2019 Plan [member] | Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Compensation Expense Per Person	$ 200,000
The 2019 Plan [member] | Non-employee Chairman, Lead independent Director, or Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Compensation Expense Per Person, First Service Year	$ 250,000
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)		80,047

X

- 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.

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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.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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