Note 15 - Derivative Financial Instruments (Details) - The Loss From Accumulated Other Comprehensive Income (Loss) (“OCI”) Into Income - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
May. 31, 2015 |
May. 31, 2014 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Interest expense (effective portion) | $ (907) | $ (1,001) |
| Interest Income [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Interest income (expense) (ineffective portion) | $ (3) | $ (10) |