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Note 8 - Product Warranty (Tables)
12 Months Ended
Nov. 30, 2022
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

For the Twelve Months Ended

 
   

November 30, 2022

   

November 30, 2021

 

Balance, beginning

  $ 202,850     $ 291,454  

Settlements / adjustments

    (349,889 )     (238,808 )

Warranties issued

    340,340       150,204  

Balance, ending

  $ 193,301     $ 202,850