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Note 14 - Supplemental Cash Flow Information (Tables)
 6 Months Ended
Feb. 28, 2019
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Three Months Ended   Six Months Ended
   
February 28,
2019
  
February 28,
2018
  
February 28,
2019
  
February 28,
2018
Cash paid for interest   $
3,835
     $
5,779
     $
6,192
     $
10,868
  
Cash paid for income taxes   $
53,975
     $
45,000
     $
53,975
     $
45,000