Note 12 - Deferred Revenue Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015
Balance at beginning of year	$ 2,766	$ 2,899
Additions to deferred revenue from new contracts	14,314	9,388
Revenue recognized during the year	(14,179)	(9,293)
Foreign currency translation adjustment	(14)	(228)
Balance at end of year	2,887	2,766
Less: Current portion	(2,864)	(2,703)
Deferred revenue, net of current portion	$ 23	$ 63