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Note 9 - Product Warranty (Tables)
9 Months Ended
Aug. 31, 2022
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

For the Three Months Ended

 
   

August 31, 2022

   

August 31, 2021

 

Balance, beginning

  $ 89,549     $ 267,500  

Settlements / adjustments

    (69,721 )     (75,204 )

Warranties issued

    136,999       53,384  

Balance, ending

  $ 156,827     $ 245,680  
   

For the Nine Months Ended

 
   

August 31, 2022

   

August 31, 2021

 

Balance, beginning

  $ 202,850     $ 291,453  

Settlements / adjustments

    (277,734 )     (177,470 )

Warranties issued

    231,711       131,697  

Balance, ending

  $ 156,827     $ 245,680