Note 12 - Fair Value (Tables)

9 Months Ended

Feb. 28, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	As of February 28, 2015
	Fair Value Measurements of Assets (Liabilities) Using								Carrying
	(Level 1)		(Level 2)			(Level 3)			Amount
	(in thousands)
Derivative instruments	$	-		(821	)		-			(821	)
Contingent consideration liabilities	$	-		-			(18,342	)		(18,342	)

	As of May 31, 2014
	Fair Value Measurements of Assets (Liabilities) Using								Carrying
	(Level 1)		(Level 2)			(Level 3)			Amount
	(in thousands)
Derivative instruments	$	-		(1,357	)		-			(1,357	)
Contingent consideration liabilities	$	-		-			(11,300	)		(11,300	)

Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]

	Nine Months Ended			Twelve Months Ended
	February 28, 2015			May 31, 2014
Balance at the beginning of the period	$	(11,300	)		(4,504	)
Additions due to acquisitions		(6,456	)		(11,300	)
Change in fair value		-			4,638
Payments		56			-
Accretion of fair value		(642	)		(134	)
Balance at the end of the period	$	(18,342	)		(11,300	)