12. STOCK-BASED COMPENSATION (Details Narrative) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Stock-based compensation costs capitalized as part of inventory	$ 0	$ 0	$ 0	$ 0
Intrinsic value of options exercised	50	23	$ 67	162
Weighted average remaining contractual life of the options exercisable and expected to be exercisable			3 years 11 months 5 days
Stock Option and RSU Transactions
Stock-based compensation expense related to stock options and RSUs	$ 163	$ 166	$ 313	$ 339
Restricted Stock Units granted (in thousands)	0	0	0	0
Restricted Stock Units vested (in thousands)	3	4	7	9
Restricted Stock Units unvested (in thousands)	16	38	16	38
Restricted Stock Units unvested intrinsic value	$ 31	$ 72	$ 31	$ 72
2016 Equity Incentive Plan
Unrecognized stock-based compensation	1,405		1,405
Estimated forfeitures of unvested stock based awards, amount	4		$ 4
Weighted average period for recognition of costs			3 years
Employee Stock Purchase Plan
Weighted average period for recognition of costs			10 months 24 days
Stock-based compensation related to the ESPP	42	$ 58	$ 91	$ 141
Compensation cost related to purchase rights under the ESPP but not yet recognized	$ 117		$ 117
ESPP purchase right granted (in thousands)	38	327	38	327
ESPP shares issued (in thousands)	71	64	71	64
ESPP shares available for issuance (in thousands)	299		299

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