12. EMPLOYEE BENEFIT PLANS (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Contributions to ESOP	$ 60	$ 60	$ 60
Shares contributed to the ESOP for fiscal year	59,000	25,000	27,000
2006 Purchase Plan
Common stock issued under ESPP plan	151,000	86,000	87,000
Shares issued under ESPP plan	1,119,000
ESPP shares available for issuance	381,000
Maximum calendar year contribution per employee	$ 25	$ 25	$ 25
Number of purchase rights share grants during the year	1,000	304,000	222,000