14. SEGMENT INFORMATION (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019	May 31, 2019	[1]
Operating lease right-of-use assets	$ 2,260		$ 2,260		$ 0
Five Largest Customers
Customers accounted for 10% or more of total revenues	94.00%	90.00%	89.00%	81.00%
Customer A
Customers accounted for 10% or more of total revenues	71.00%	27.00%	51.00%	31.00%
Customer B
Customers accounted for 10% or more of total revenues		25.00%	18.00%	18.00%
Customer C
Customers accounted for 10% or more of total revenues		22.00%		16.00%
Customer D
Customers accounted for 10% or more of total revenues		13.00%		12.00%

[1] The condensed consolidated balance sheet at May 31, 2019 has been derived from the audited consolidated financial statements at that date.