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Note 10 - Stockholders' Equity (Details Textual) - $ / shares					12 Months Ended
	Mar. 01, 2022	Sep. 01, 2021	Mar. 01, 2021	Sep. 01, 2020	Aug. 31, 2022	Aug. 31, 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
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, Including Cashless Exercises (in shares)					51,218	77,645
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)					$ 6.60	$ 8.18
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)						74,950
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)	2,966	2,635	5,225	4,646
The 2019 Plan [member]
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, Including Cashless Exercises (in shares)					51,218
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)					$ 6.60
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)					42,071
ESPP [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					69,221

X

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Number of share options (or share units) exercised during the current period, including cashless exercises.

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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