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Note 14 - Stockholders' Equity (Tables)
 12 Months Ended
Aug. 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
August
10, 2017
   $
0.56
  
Regular (cash)
August 31, 201
7
   $
21,853
  
September
19, 2017
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)
February 29, 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
May 12, 2015
   $
0.44
  
Regular (cash)
May 29, 2015
   $
18,274
  
June 16, 2015
February 11, 2015
   $
0.39
  
Regular (cash)
February 27, 2015
   $
16,236
  
March 17, 2015
November 12, 2014
   $
0.39
  
Regular (cash)
November 28, 2014
   $
16,216
  
December 16, 2014