Note 8 - Convertible Debentures and Notes Payable - Convertible Debentures (Details) - USD ($)	Aug. 31, 2018	May 31, 2018
10% Convertible note payable, dated June 19, 2018, due June 19, 2019	$ 850,000	$ 3,567,670
Convertible Note Payable Due June 19, 2019 [Member]
10% Convertible note payable, dated June 19, 2018, due June 19, 2019	150,000
First Convertible Note Payable Due December 29, 2018 [Member]
10% Convertible note payable, dated June 19, 2018, due June 19, 2019	247,450
Second Convertible Note Payable Due December 29, 2018 [Member]
10% Convertible note payable, dated June 19, 2018, due June 19, 2019	452,550
Convertible Notes Repaid, Transferred or Converted to Common Stock [Member]
10% Convertible note payable, dated June 19, 2018, due June 19, 2019		$ 3,567,670