Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Inventory (Tables)

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Note 7 - Inventory (Tables)
3 Months Ended
Aug. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventory, consisting of material, overhead, labor, and manufacturing overhead, is stated at the lower of cost (first-in, first-out) or market, and consists of the following:

   

August 31,

   

May 31,

 
   

2019

   

2019

 

Raw materials

  $ 258,302     $ 323,635  

Finished goods

    515,812       423,198  

Total

  $ 774,114     $ 746,833