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Note 13 - Fair Value Measurements (Tables)
6 Months Ended
Feb. 28, 2018
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]
       
Fair Value Measurements
Using Inputs Considered as
   
Fair value as of
February 28, 2018
  Level 1   Level 2   Level 3
Available for sale securities   $
3,268,426
    $
3,268,426
    $
    $
 
       
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
    $
    $