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Note 8 - Stockholders' Equity (Details Textual)					3 Months Ended	6 Months Ended
	Sep. 01, 2019 shares	Jun. 28, 2019	Jun. 03, 2019	Sep. 01, 2018 shares	Nov. 30, 2018 shares	Feb. 29, 2020 $ / shares shares	Feb. 28, 2019 $ / shares shares
Stockholders' Equity Note, Stock Split, Conversion Ratio		2	2
Stock Repurchased and Retired During Period, Shares					0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						300,770	141,768
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						0	0
Stock Issued During Period, Shares, Employee Stock Purchase Plans	3,597			1,748
The 2019 Plan [member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						300,770
The 2019 Plan [member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						300,770
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares						$ 10.87
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross							141,767
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares							$ 18.23

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