15. SEGMENT INFORMATION (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2020	[1]
Operating lease right-of-use assets	$ 1,918		$ 1,918		$ 2,107
Five Largest Customers
Customers accounted for 10% or more of total revenues	90.00%	95.00%	74.00%	88.00%
Customer A
Customers accounted for 10% or more of total revenues	22.00%	44.00%	20.00%	42.00%
Customer B
Customers accounted for 10% or more of total revenues	18.00%	32.00%	18.00%	24.00%
Customer C
Customers accounted for 10% or more of total revenues	18.00%		15.00%	10.00%
Customer D
Customers accounted for 10% or more of total revenues	16.00%		11.00%
Customer E
Customers accounted for 10% or more of total revenues	15.00%		10.00%

[1] The condensed consolidated balance sheet at May 31, 2020 has been derived from the audited consolidated financial statements at that date.