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Note 13 - Fair Value Measurements (Tables)
6 Months Ended
Feb. 29, 2020
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
        Fair Value Measurements
Using Inputs Considered as
    Fair value as of
February 29, 2020
  Level 1   Level 2   Level 3
Available for sale securities   $
6,512,166
    $
6,512,166
    $
    $
 
        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
    $
    $