Note 13 - Fuel Derivatives (Details Textual) $ in Millions |
12 Months Ended |
|---|---|
|
Jun. 30, 2016
USD ($)
gal
| |
| Diesel Fuel Future Contracts [Member] | |
| Derivative, Nonmonetary Notional Amount, Volume | 3,906,000 |
| Derivative, Nonmonetary Notional Amount, Volume per Month | 300,000 |
| Derivative Nonmonetary, Percentage of Monthly Projected Fuel Requirements | 8.90% |
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ | $ (0.1) |