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Note 13 - Stockholders' Equity (Tables)
 9 Months Ended
May 31, 2017
Notes Tables  
Dividends Declared [Table Text Block]
Declaration Date
  
Dividends Per
Share of
Common Stock
  
Type
Record Date
 
Total $ Amount
(in thousands)
 
Payment Date
May 5, 2017
   $
0.56
  
Regular (cash)
May 31, 2017
   $
21,951
  
June 20, 2017
February 6, 2017
   $
0.50
  
Regular (cash)
February 28, 2017
   $
19,709
  
March 21, 2017
November 10, 2016
   $
0.50
  
Regular (cash)
November 30, 2016
   $
19,852
  
December 20, 2016
August 5, 2016
   $
0.50
  
Regular (cash)
August 31, 2016
   $
20,019
  
September 20, 2016
May 6, 2016
   $
0.50
  
Regular (cash)
May 31, 2016
   $
20,171
  
June 21, 2016
February 5, 2016
   $
0.44
  
Regular (cash)
May 31, 2016
   $
18,044
  
March 15, 2016
November 6, 2015
   $
0.44
  
Regular (cash)
November 30, 2015
   $
18,208
  
December 15, 2015
August 10, 2015
   $
0.44
  
Regular (cash)
August 31, 2015
   $
18,179
  
September 15, 2015