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Note 4 - Inventory (Tables)
9 Months Ended
Feb. 28, 2026
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

February 28,

   

May 31,

 
   

2026

   

2025

 

Raw materials

  $ 2,064,399     $ 2,137,159  

Finished goods

    699,557       1,346,879  

Total inventory

  $ 2,763,956     $ 3,484,038