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Note 3 - Fair Value of Financial Instruments (Tables)
12 Months Ended
May 31, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
May 31, 2019   Level 1
         
Cash and cash equivalents   $
4,145,085
 
May 31, 2018   Level 1
         
Cash and cash equivalents   $
2,610,541