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Note 12 - Stockholders' Equity (Tables)
 9 Months Ended
May 31, 2019
Notes Tables  
Dividends Declared [Table Text Block]
Year Ended
  
Dividends per
Share of
Common Stock
  
Record Date
  
Total $ Amount
(in thousands)
  
Payment Date
Fiscal 2019
                    
First Quarter
   $
0.64
  
November 30, 2018
   $
24,372
  
December 18, 2018
Second Quarter
   $
0.64
  
February 28, 2019
   $
24,385
  
March 19, 2019
Third Quarter
   $
0.72
  
May 31, 2019
   $
27,506
  
June 18, 2019
                     
Fiscal 2018
                    
First Quarter
   $
0.56
  
November 30, 2017
   $
21,902
  
December 19, 2017
Second Quarter
   $
0.56
  
February 28, 2018
   $
21,799
  
March 20, 2018
Third Quarter
   $
0.64
  
May 31, 2018
   $
24,566
  
June 19, 2018