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Note 8 - Stockholders' Equity (Details Textual) - $ / shares				3 Months Ended
	Sep. 01, 2020	Oct. 22, 2019	Sep. 01, 2019	Nov. 30, 2020	Nov. 30, 2019
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.065		$ 0	$ 0.065
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)				419,874	300,770
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)				0	0
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)	4,646		3,597
The 2019 Plan [member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				419,874	300,770
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)				$ 8.24	$ 10.80

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

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