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Note 10 - Product Warranty (Tables)
3 Months Ended
Feb. 28, 2026
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Three Months Ended (Continuing Operations)

 
  

February 28, 2026

  

February 28, 2025

 

Balance, beginning

 $225,000  $225,186 

Provision charged to expense

  77,939   85,040 

Less amounts charged-off

  (72,034)  (119,395)

Balance, ending

 $230,905  $190,831