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Note 8 - Stockholders' Equity (Tables)
 6 Months Ended
Feb. 29, 2020
Notes Tables  
Dividends Declared [Table Text Block]
Declaration Date
Amount
Record Date
Payable Date
October 22, 2019
$0.065
November 6, 2019
November 20, 2019
January 22, 2020
$0.065
February 5, 2020
February 19, 2020
Declaration Date
Amount
Record Date
Payable Date
October 24, 2018
$0.06
November 7, 2018
November 21, 2018
January 23, 2019
$0.06
February 6, 2019
February 22, 2019