Note 10 - Derivative Financial Instruments (Tables)

3 Months Ended

Aug. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Interest Rate Derivatives [Table Text Block]

	As of
	August 31, 2013			May 31, 2013
Interest rate swaps (included in other liabilities)	$	(1,367	)		(1,906	)

Derivative Instruments, Gain (Loss) [Table Text Block]

	Three Months Ended August 31
Location of (loss) gain reclassified from AOCI into income	2013			2012
Interest expense (effective portion)	$	(257	)		(266	)
Interest income (expense) (ineffective portion)	$	3			(3	)