1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2017	May 31, 2016	May 31, 2015
Organization And Summary Of Significant Accounting Policies Details 5
Numerator: Net (loss) income	$ (795)	$ (2,651)	$ (1,452)	$ (755)	$ (3,056)	$ (2,975)	$ (1,048)	$ 294	$ (5,653)	$ (6,785)	$ (6,647)
Denominator for basic net loss per share: Weighted-average shares outstanding									16,267,000	13,091,000	12,047,000
Shares used in basic net loss per share calculation									16,267,000	13,091,000	12,047,000
Effect of dilutive securities									0	0	0
Denominator for diluted net loss per share									16,267,000	13,091,000	12,047,000
Basic net loss per share									$ (0.35)	$ (0.52)	$ (0.55)
Diluted net loss per share									$ (0.35)	$ (0.52)	$ (0.55)