Note 13 - Contingent Consideration Liability (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Feb. 29, 2016	May. 31, 2015
Balance	$ (19,409)	$ (18,596)
Additions due to acquisitions		(6,469)
Payments	$ 48	87
Accretion of fair value	$ (861)	$ (914)