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Note 8 - Stockholders' Equity (Details Textual)					3 Months Ended
	Oct. 22, 2019 $ / shares	Jun. 28, 2019	Jun. 03, 2019	Oct. 24, 2018 $ / shares	Nov. 30, 2019 $ / shares shares	Nov. 30, 2018 $ / shares shares
Stockholders' Equity Note, Stock Split, Conversion Ratio		2	2
Common Stock, Dividends, Per Share, Declared | $ / shares	$ 0.065			$ 0.06	$ 0.065	$ 0.06
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					$ 10.80
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						141,768
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares						$ 18.23

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

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