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Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
Apr. 30, 2022
Notes to Financial Statements  
Allowance for Doubtful Accounts for Trade Accounts Receivable Disclosure [Text Block]

(3)

Allowance for Doubtful Accounts for Trade Accounts Receivable

 

A summary of changes in the allowance for doubtful accounts for trade accounts receivable for the six months ended April 30, 2022 and 2021 follows:

 

   

Six Months Ended

 
   

April 30,

 
   

2022

   

2021

 

Balance at beginning of period

  $ 61,527     $ 524,617  

Bad debt expense

    18,038       4,616  

Balance at end of period

  $ 79,565     $ 529,233