XML 46 R27.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables)
 12 Months Ended
Oct. 31, 2017
Notes Tables  
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block]
   
Years ended October 31,
  
   
2017
    
2016
    
2015
  
Balance at beginning of year
   $
74,266
     $
63,011
     $
92,988
  
Bad debt expense (recovery)
    
21,569
      
11,255
      
(16,889
 )
Losses charged to allowance
    
(8,389
 )    
—
      
(13,088
 )
Balance at end of year
   $
87,446
     $
74,266
     $
63,011