Note 11 - Fair Value (Tables)

6 Months Ended

Nov. 30, 2016

Notes Tables

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

	As of November 30, 2016
	Fair Value Measurements of Assets (Liabilities) Using							Carrying
	(Level 1)		(Level 2)		(Level 3)			Amount
	(in thousands)
Derivative instruments	$	-		-		-			-
Contingent consideration liabilities	$	-		-		(42,344	)		(42,344	)

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

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

	Six Months Ended			Twelve Months Ended
	November 30, 2016			May 31, 2016
Balance at the beginning of the period	$	(40,356	)		(18,596	)
Additions due to acquisitions		-			(20,000	)
Payments		6			65
Accretion of fair value		(1,994	)		(1,825	)
Balance at the end of the period	$	(42,344	)		(40,356	)