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Note 11 - Fair Value (Details) - Fair Value of Derivatives (USD $)	Feb. 28, 2014	May 31, 2013
Note 11 - Fair Value (Details) - Fair Value of Derivatives [Line Items]
Derivative instruments	$ (1,516,000)	$ (1,906,000)
Contingent consideration liability		(4,504,000)
Contingent consideration liability		(4,504,000)
Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value (Details) - Fair Value of Derivatives [Line Items]
Derivative instruments	(1,516,000)	(1,906,000)
Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value (Details) - Fair Value of Derivatives [Line Items]
Contingent consideration liability		(4,504,000)
Contingent consideration liability		$ (4,504,000)

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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