Note 8 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Jun. 30, 2015 |
|---|---|---|
| Fair Value, Inputs, Level 1 [Member] | ||
| Foreign currency derivatives | ||
| Fuel derivatives | ||
| Fair Value, Inputs, Level 2 [Member] | ||
| Foreign currency derivatives | ||
| Fuel derivatives | $ (2,161) | |
| Fair Value, Inputs, Level 3 [Member] | ||
| Foreign currency derivatives | ||
| Fuel derivatives | ||
| Foreign currency derivatives | ||
| Fuel derivatives | $ (2,161) |