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Note 13 - Fair Value Measurements (Tables)
 3 Months Ended
Nov. 30, 2019
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, 2019		   Level 1   Level 2   Level 3
Available for sale securities   $
2,987,095
     $
2,987,095
     $
—
     $
—
  
        Fair Value Measurements
Using Inputs Considered as
    Fair value as of
August 31, 2019		   Level 1   Level 2   Level 3
Available for sale securities   $
3,565,258
     $
3,565,258
     $
—
     $
—