Note 13 - Other Long-term Liabilities (Details) - Other Long-term Liabilities (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013	May 31, 2012
Other Long-term Liabilities [Abstract]
Unrecognized tax benefits	$ 10,399	$ 10,178	$ 13,597
Contingent consideration liability	11,300	4,504
Severance indemnity for employees	1,384	1,222
Interest rate swap liability	626	1,057
Deferred leasehold improvement incentive	124	115
Other long-term liabilities	$ 23,833	$ 12,572