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Note 9 - Product Warranty (Tables)
3 Months Ended
Feb. 28, 2022
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

For the Three Months Ended

 
  

February 28, 2022

  

February 28, 2021

 

Balance, beginning

 $202,850  $291,453 

Settlements / adjustments

  21,624   33,506 

Warranties issued

  (109,412)  (29,378)

Balance, ending

 $115,062  $295,581