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Note 13 - Fair Value Measurements (Tables)
3 Months Ended
Nov. 30, 2018
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
        Fair Value Measurements
Using Inputs Considered as
    Fair value as of
November 30, 2018
  Level 1   Level 2   Level 3
Available for sale securities   $
1,711,930
    $
1,711,930
    $
—  
    $
—  
 
        Fair Value Measurements
Using Inputs Considered as
    Fair value as of
August 31, 2018
  Level 1   Level 2   Level 3
Available for sale securities   $
3,300,110
    $
3,300,110
    $
—  
    $
—