Note 16 - Fair Value (Tables)

12 Months Ended

May 31, 2016

Notes Tables

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

	As of May 31, 2016
	Fair Value Measurements of Assets (Liabilities) Using								Carrying
	(Level 1)		(Level 2)			(Level 3)			Amount
	(in thousands)
Derivative instruments	$	-		(155	)		-			(155	)
Contingent consideration liabilities	$	-		-			(40,356	)		(40,356	)

	As of May 31, 2015
	Fair Value Measurements of Assets (Liabilities) Using								Carrying
	(Level 1)		(Level 2)			(Level 3)			Amount
	(in thousands)
Derivative instruments	$	-		(686	)		-			(686	)
Contingent consideration liability	$	-		-			(18,596	)		(18,596	)

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

	Year Ended May 31
	2016			2015
Balance at the beginning of the period	$	(18,596	)		(11,300	)
Additions due to acquisitions		(20,000	)		(6,469	)
Payments		65			87
Accretion of fair value		(1,825	)		(914	)
Balance at the end of the period	$	(40,356	)		(18,596	)