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Note 8 - Product Warranty (Tables)
12 Months Ended
Nov. 30, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

For the Twelve Months Ended

 
  

November 30, 2021

  

November 30, 2020

 

Balance, beginning

 $291,454  $203,185 

Settlements / adjustments

  (238,808)  (157,501)

Warranties issued

  150,204   245,770 

Balance, ending

 $202,850  $291,454