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Note 10 - Derivative Financial Instruments (Detail) - Interest Expense on Derivatives (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2012
Interest expense (effective)	$ (220)	$ (518)
Interest expense (ineffective)		$ (7)

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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