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Note 9 - Product Warranty (Tables)
6 Months Ended
May 31, 2023
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Three Months Ended

 
   

May 31, 2023

   

May 31, 2022

 

Balance, beginning

  $ 194,464     $ 115,062  

Provision charged to expense

    115,739       73,088  

Less amounts charged-off

    (56,759 )     (98,601 )

Balance, ending

  $ 253,444     $ 89,549  
   

Six Months Ended

 
   

May 31, 2023

   

May 31, 2022

 

Balance, beginning

  $ 193,301     $ 202,850  

Provision charged to expense

    231,335       94,712  

Less amounts charged-off

    (171,192 )     (208,013 )

Balance, ending

  $ 253,444     $ 89,549