Note 5 - Prepaid Expenses And Other Current Assets (Details) - Prepaid Expenses And Other Current Assets (USD $) In Thousands, unless otherwise specified	May 31, 2013	May 31, 2012
Prepaid Expenses And Other Current Assets [Abstract]
Income tax prepayments	$ 4,899	$ 5,608
Prepaid expenses	4,805	5,357
Other receivables	1,873	773
Prepaid expenses and other current assets	$ 11,577	$ 11,738