Note 18 - Income Taxes (Details) - Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Unrecognized Tax Benefits [Abstract]
Balance, beginning of period	$ 10,178	$ 13,597
Change due to Acquisitions		324
Gross (decreases)increases in unrecognized tax benefits as a result of tax positions taken during a prior period	(35)	172
Gross increases(decreases) in unrecognized tax benefits as a result of tax positions taken during current period	788	1,690
Reductions to unrecognized tax benefits as a result of the applicable statute of limitations	(619)	(3,054)
Balance, end of period	$ 10,399	$ 10,178