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Note 13 - Fair Value Measurements (Tables)
 9 Months Ended
May 31, 2019
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
       
Fair Value Measurements
Using Inputs Considered as
   
 
Fair value as of
May 31, 2019
 
     Level 1       Level 2       Level 3  
Available for sale securities   $
2,540,613
     $
2,540,613
     $
—
     $
—
  
       
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
     $
—
     $
—