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Note 14 - Stockholders' Equity (Tables)
 12 Months Ended
Aug. 31, 2018
Notes Tables  
Dividends Declared [Table Text Block]
Year Ended
  
Dividends per
Share of
Common Stock
  
Record Date
  
Total amount
(in thousands)
  
Payment Date
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
Fourth Quarter
   $
0.64
  
August 31, 2018
   $
24,443
  
September 18, 2018
                     
Fiscal 2017
                    
First Quarter
   $
0.50
  
November 30, 2016
   $
19,852
  
December 20, 2016
Second Quarter
   $
0.50
  
February 28, 2017
   $
19,709
  
March 21, 2017
Third Quarter
   $
0.56
  
May 31, 2017
   $
21,951
  
June 20, 2017
Fourth Quarter
   $
0.56
  
August 31, 2017
   $
21,853
  
September 19, 2017