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Note 4 - Capital Assets (Tables)
6 Months Ended
Nov. 30, 2022
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  November 30,  May 31, 
  2022  2022 

Land

 $28,967  $31,882 

Production facility

  430,631   453,412 

Equipment

  219,282   254,486 

Leasehold improvement

  7,772   7,455 

Construction in progress

  8,421   7,505 
  $695,073  $754,740 

Less: accumulated amortization

  (155,949)  (167,241)

Total

 $539,124  $587,499