7. INCOME TAXES (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Components of Unrecognized Tax Benefits
Unrecognized tax benefit, Beginning	$ 1,007	$ 1,022	$ 1,093
Decreases related to prior year tax positions	0	0	0
Decreases related to lapse of statute of limitations	(34)	(15)	(71)
Unrecognized tax benefit, Ending	$ 973	$ 1,007	$ 1,022