Note 14 - Other Long-term Liabilities (Details) - Other Long-term Liabilities - USD ($) $ in Thousands |
May. 31, 2015 |
May. 31, 2014 |
May. 31, 2013 |
|---|---|---|---|
| Other Long-term Liabilities [Abstract] | |||
| Contingent consideration liability | $ 18,526 | $ 11,300 | $ 4,504 |
| Unrecognized tax benefits | 9,066 | 10,399 | $ 12,729 |
| Severance indemnity for employees | 1,223 | 1,384 | |
| Interest rate swap and other liabilities | 252 | 712 | |
| Deferred leasehold improvement incentive | 145 | 124 | |
| Other long-term liabilities | $ 29,212 | $ 23,919 |