13. SEGMENT INFORMATION (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018	May 31, 2019	[1]
Operating lease right-of-use assets	$ 2,387		$ 2,387		$ 0
Five Largest Customers
Customers accounted for 10% or more of total revenues	95.00%	94.00%	88.00%	83.00%
Customer A
Customers accounted for 10% or more of total revenues	44.00%	55.00%	42.00%	33.00%
Customer B
Customers accounted for 10% or more of total revenues	32.00%	13.00%	24.00%	16.00%
Customer C
Customers accounted for 10% or more of total revenues	13.00%		10.00%	15.00%
Customer D
Customers accounted for 10% or more of total revenues				13.00%

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