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2. STOCK-BASED COMPENSATION (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Stock-based compensation costs capitalized as part of inventory $ 0 $ 0
Intrinsic value of options exercised $ 52 60
Weighted average remaining contractual life of the options exercisable and expected to be exercisable 4 years 2 months 16 days  
Restricted Stock Units    
Stock-based compensation expense related to stock options and RSUs $ 279 286
Restricted Stock Units granted 138,000  
Market value on the date of the grant $ 1.68  
1996 Stock Option Plan and 2006 Equity Incentive Plan    
Unrecognized stock-based compensation $ 1,258  
Estimated forfeitures of unvested stock based awards, amount $ 3  
Weighted average period for recognition of costs 2 years 6 months  
Employee Stock Purchase Plan    
Stock-based compensation related to the ESPP $ 40 $ 33
Compensation cost related to purchase rights under the ESPP but not yet recognized $ 98  
Weighted average period for recognition of costs 1 year 1 month 6 days