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Note 8 - Stockholders' Equity (Details Textual)									3 Months Ended	12 Months Ended
	Jan. 22, 2020 $ / shares	Oct. 22, 2019 $ / shares	Jul. 24, 2019 $ / shares	Jun. 28, 2019	Jun. 03, 2019	Apr. 25, 2019 $ / shares	Jan. 23, 2019 $ / shares	Oct. 24, 2018 $ / shares	May 31, 2020 $ / shares	Aug. 31, 2020 USD ($) $ / shares shares	Aug. 31, 2019 $ / shares shares	Jan. 15, 2015 USD ($)
Stockholders' Equity Note, Stock Split, Conversion Ratio				2	2
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.065	$ 0.065	$ 0.06			$ 0.06	$ 0.06	$ 0.06	$ 0	$ 0.13	$ 0.24
Stock Repurchase Program, Authorized Amount | $												$ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $										$ 2,640,548
Stock Repurchased and Retired During Period, Shares (in shares)										0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises (in shares)										11,974
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares										$ 5.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)										6,823	0

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

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