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Note 10 - Stockholders' Equity (Details Textual) - $ / shares				3 Months Ended
	Oct. 20, 2021	Sep. 01, 2021	Sep. 01, 2020	Nov. 30, 2021	Nov. 30, 2020
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.07			$ 0.07	$ 0
Dividends Payable, Date Declared	Nov. 17, 2021
Stock Repurchased and Retired During Period, Shares (in shares)				0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				174,840	419,874
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)		2,636	4,646
Dividends Payable, Date of Record	Nov. 17, 2021
The 2019 Plan [member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				895,484
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				704,516
The 2019 Plan [member] | Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				174,840	419,874
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)				$ 16.97	$ 8.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)				16,000	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)				$ 8.70
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				72,186

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Aggregate dividends declared during the period for each share of common stock outstanding.

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