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Note 8 - Stockholders' Equity - Schedule of Dividends Payable (Details) - $ / shares
12 Months Ended
Jul. 24, 2019
Apr. 25, 2019
Jan. 23, 2019
Oct. 24, 2018
Jul. 25, 2018
Apr. 25, 2018
Jan. 24, 2018
Nov. 20, 2017
Aug. 31, 2019
Aug. 31, 2018
Amount (in dollars per share) $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.24 $ 0.20
Record Date Aug. 07, 2019 May 09, 2019 Feb. 06, 2019 Nov. 07, 2018 Aug. 08, 2018 May 09, 2018 Feb. 07, 2018 Dec. 08, 2017    
Payable Date Aug. 21, 2019 May 23, 2019 Feb. 22, 2019 Nov. 21, 2018 Aug. 22, 2018 May 23, 2018 Feb. 21, 2018 Dec. 21, 2017