Note 8 - Stockholders' Equity (Details Textual)			12 Months Ended
	Jun. 28, 2019	Jun. 03, 2019	Aug. 31, 2019 USD ($) $ / shares shares	Aug. 31, 2018 $ / shares shares	Jan. 15, 2015 USD ($)
Stockholders' Equity Note, Stock Split, Conversion Ratio	2	2
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			0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	8,820
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises				12,814
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares				$ 5.80