Note 12 - Fair Value (Details) - Contingent Consideration Liability - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	May. 31, 2015
Contingent Consideration Liability [Abstract]
Balance at the beginning of the period	$ (18,596)	$ (11,300)	$ (11,300)
Additions due to acquisitions			(6,469)
Payments	18		87
Accretion of fair value	(285)	$ (123)	(914)
Balance at the end of the period	$ (18,863)		$ (18,596)