Note 12 - Deferred Revenue (Details) - Deferred Revenue Activity - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
May. 31, 2015 |
May. 31, 2014 |
|
| Deferred Revenue Activity [Abstract] | ||
| Balance at beginning of year | $ 2,899 | $ 2,413 |
| Additions to deferred revenue from new contracts | 9,388 | 8,658 |
| Revenue recognized during the year | (9,293) | (8,246) |
| Foreign currency translation adjustment | (228) | 74 |
| Balance at end of year | 2,766 | 2,899 |
| Less current portion | (2,703) | (2,813) |
| Deferred revenue, net of current portion | $ 63 | $ 86 |