7. INCOME TAXES (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015	May 31, 2014
Valuation Allowance	$ 1,635	$ 421	$ 2,223
Foreign net operating loss carryforwards	892
Unrecognized tax benefits	789	$ 789	$ 919	$ 973
Federal
Net operating loss carryforward	51,851
Research and development tax credit carryforwards	1,982
Alternative minimum tax credit carryforwards	91
State
Net operating loss carryforward	30,351
Research and development tax credit carryforwards	5,164
Alternative minimum tax credit carryforwards	$ 34