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Note 2 - Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Nov. 30, 2020
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   
Twelve Months Ended
 
   
November 30, 2020
    
November 30, 2019
  
Balance, beginning
   $
22,925
     $
25,100
  
Provision charged to expense
    
44,222
      
(1,602
 )
Less amounts charged-off
    
(15,972
 )    
(573
 )
Balance, ending
   $
51,175
     $
22,925