2. ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014
Accounts Receivable Details
Accounts receivable, Gross	$ 1,404	$ 3,441
Allowance for doubtful accounts, Beginning	(51)	(39)
Allowance for doubtful accounts, Additions charged to costs and expenses	0	(15)
Allowance for doubtful accounts, Deductions	30	3
Allowance for doubtful accounts, Ending	(21)	(51)
Accounts receivable, Net	$ 1,383	$ 3,390