Note 5 - Prepaid Expenses and Other Current Assets (Details) - Prepaid Expenses and Other Current Assets (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013
Prepaid Expenses and Other Current Assets [Abstract]
Income tax prepayments	$ 5,736	$ 4,899
Prepaid expenses	5,677	4,805
Other receivables	1,169	1,873
Prepaid expenses and other current assets	$ 12,582	$ 11,577