12. STOCK-BASED COMPENSATION (Details Narrative) - USD ($) $ in Thousands	3 Months Ended
Aug. 31, 2019	Aug. 31, 2018
Stock-based compensation costs capitalized as part of inventory	$ 0	$ 0
Intrinsic value of options exercised	$ 17	139
Weighted average remaining contractual life of the options exercisable and expected to be exercisable	3 years 10 months 17 days
Stock Option and RSU Transactions
Stock-based compensation expense related to stock options and RSUs	$ 150	$ 173
Restricted Stock Units granted (in thousands)	0	0
Restricted Stock Units vested (in thousands)	3	4
Restricted Stock Units unvested (in thousands)	20	43
Restricted Stock Units unvested intrinsic value	$ 26	$ 108
2016 Equity Incentive Plan
Unrecognized stock-based compensation	1,508
Estimated forfeitures of unvested stock based awards, amount	$ 4
Weighted average period for recognition of costs	3 years 2 months 12 days
Employee Stock Purchase Plan
Weighted average period for recognition of costs	1 year 1 month 6 days
Stock-based compensation related to the ESPP	$ 49	$ 83
Compensation cost related to purchase rights under the ESPP but not yet recognized	$ 131
ESPP purchase right granted (in thousands)	0	0
ESPP shares issued (in thousands)	0	0
ESPP shares available for issuance (in thousands)	369

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