Note 15 - Fair Value (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $)	May 31, 2014	May 31, 2013
Note 15 - Fair Value (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Derivative instruments	$ (1,357,000)	$ (1,906,000)
Contingent consideration liability	(11,300,000)	(4,504,000)
Fair Value, Inputs, Level 2 [Member]
Note 15 - Fair Value (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Derivative instruments	(1,357,000)	(1,906,000)
Fair Value, Inputs, Level 3 [Member]
Note 15 - Fair Value (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Contingent consideration liability	$ (11,300,000)	$ (4,504,000)