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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables)
6 Months Ended
Apr. 30, 2019
Notes Tables  
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block]
   

Six Months Ended

 
   

April 30,

 
   

2019

   

2018

 

Balance at beginning of period

  $ 64,242     $ 87,446  

Bad debt expense

    42,693       4,856  

Losses charged to allowance

    (24,811 )     (3,126 )

Balance at end of period

  $ 82,124     $ 89,176