XML 21 R9.htm IDEA: XBRL DOCUMENT v3.7.0.1
Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable
 6 Months Ended
Apr. 30, 2017
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, 2017
and
2016
follows:
 
 
 
Six Months Ended
 
 
 
April 30,
 
 
 
2017
 
 
2016
 
Balance at beginning of period
   $
74,266
    $
63,011
 
Bad debt expense
   
11,169
     
12,019
 
Losses charged to allowance
    
(4,729
 )    
—
  
Balance at end of period
   $
80,706
    $
75,030