Note 15 - Fair Value (Details) - Contingent Consideration Liability (USD $) In Thousands, unless otherwise specified	5 Months Ended	12 Months Ended
	May 31, 2014	May 31, 2014	May 31, 2013
Contingent Consideration Liability [Abstract]
Balance at the beginning of the period		$ (4,504)
Additions due to acquisitions		(11,300)	(4,400)
Change in fair value		4,638	(2,616)
Accretion of fair value	(134)	(134)	(104)
Balance at the end of the period	$ (11,300)	$ (11,300)	$ (4,504)