Note 4 - Operating Revenue by Geographic Area (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| UNITED STATES | ||||
| Operating revenues | $ 228,458 | $ 196,287 | $ 703,010 | $ 532,664 |
| CANADA | ||||
| Operating revenues | 19,745 | 23,485 | 62,883 | 80,481 |
| MEXICO | ||||
| Operating revenues | 11,371 | 11,930 | 35,201 | 34,343 |
| Operating revenues | $ 259,574 | $ 231,702 | $ 801,094 | $ 647,488 |