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Note 10 - Product Warranty (Tables)
9 Months Ended
Aug. 31, 2023
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Three Months Ended (Continuing operations)

 
  

August 31, 2023

  

August 31, 2022

 

Balance, beginning

 $252,444  $89,549 

Provision charged to expense

  (102,485)  (69,721)

Less amounts charged-off

  114,074   136,999 

Balance, ending

 $264,033  $156,827 
  

Nine Months Ended

 
  

August 31, 2023

  

August 31, 2022

 

Balance, beginning

 $192,301  $202,850 

Provision charged to expense

  (273,677)  (277,734)

Less amounts charged-off

  345,409   231,711 

Balance, ending

 $264,033  $156,827