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Note 2 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables)
 12 Months Ended
Oct. 31, 2016
Notes Tables  
Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block]
 
 
Years ended October 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Balance at beginning of year
   $
63,011
    $
92,988
    $
74,073
 
Bad debt expense (recovery)
    
11,255
     
(16,889
 )    
18,915
 
Losses charged to allowance
    
—
     
(13,088
 )    
—
 
Balance at end of year
   $
74,266
    $
63,011
    $
92,988