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Note 9 - Product Warranty (Tables)
9 Months Ended
Aug. 31, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

For the Three Months Ended

 
  

August 31, 2021

  

August 31, 2020

 

Balance, beginning

 $267,500  $239,233 

Settlements / adjustments

  (75,204)  (37,146)

Warranties issued

  53,384   66,146 

Balance, ending

 $245,680  $268,233 
  

For the Nine Months Ended

 
  

August 31, 2021

  

August 31, 2020

 

Balance, beginning

 $291,453  $203,185 

Settlements / adjustments

  (177,470)  (65,722)

Warranties issued

  131,697   130,770 

Balance, ending

 $245,680  $268,233