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Note 9 - Product Warranty (Tables)
6 Months Ended
May 31, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
For the Three Months Ended
 
   
May 31, 2021
   
May 31, 2020
 
Balance, beginning
  $
295,581
    $
239,233
 
Settlements / adjustments
   
(72,888
)    
(37,146
)
Warranties issued
   
44,807
     
66,146
 
Balance, ending
  $
267,500
    $
268,233
 
   
For the Six Months Ended
 
   
May 31, 2021
   
May 31, 2020
 
Balance, beginning
  $
291,454
    $
203,185
 
Settlements / adjustments
   
(102,267
)    
(65,722
)
Warranties issued
   
78,313
     
130,770
 
Balance, ending
  $
267,500
    $
268,233