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Note 10 - Stock-based Compensation (Details Textual)							12 Months Ended
	Jun. 28, 2019	Jun. 03, 2019	Mar. 01, 2019 shares	Sep. 01, 2018 shares	Mar. 01, 2018 shares	Sep. 01, 2017 shares	Aug. 31, 2019 USD ($) $ / shares shares	Aug. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross							141,767	94,504
Stock Issued During Period, Shares, Employee Stock Purchase Plans			2,462	1,748	1,970	1,780
Stock or Unit Option Plan Expense | $							$ 1,431,925	$ 413,010
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year | $							$ 65,270
Stockholders' Equity Note, Stock Split, Conversion Ratio	2	2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares							$ 9.02	$ 3.88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term							5 years 328 days	5 years 21 days
The 2019 Plan [member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							800,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period							10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross							0
The 2019 Plan [member] | One Year after Date of Grant [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							3 years
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							200,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent							90.00%
Common Stock, Capital Shares Reserved for Future Issuance							91,044

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