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Note 13 - Fair Value Measurements (Tables)
 3 Months Ended
Nov. 30, 2017
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]
       
Fair Value Measurements
Using Inputs Considered as
   
Fair value as of
November 30, 2017
   Level 1   Level 2   Level 3
Available for sale securities   $
3,770,241
     $
3,770,241
     $
—
     $
—
  
       
Fair Value Measurements
Using Inputs Considered as
   
Fair value as of
August 31, 2017
   Level 1   Level 2   Level 3
Available for sale securities   $
3,766,984
     $
3,766,984
     $
—
     $
—