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Note 11 - Fair Value (Details) - Fair Value of Derivatives (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013	May 31, 2013	May 31, 2012
Note 11 - Fair Value (Details) - Fair Value of Derivatives [Line Items]
Derivative instruments (included in other liabilities), carrying amount	$ (1,367)		$ (1,906)
Contingent consideration liability (included in other liabilities), fair value	(3,251)	(4,504)	(4,504)
Contingent consideration liability (included in other liabilities), carrying amount	(3,251)	(4,504)	(4,504)
Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value (Details) - Fair Value of Derivatives [Line Items]
Derivative instruments (included in other liabilities), fair value	(1,367)		(1,906)
Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value (Details) - Fair Value of Derivatives [Line Items]
Contingent consideration liability (included in other liabilities), fair value	(3,251)		(4,504)
Contingent consideration liability (included in other liabilities), carrying amount	$ (3,251)		$ (4,504)

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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