Note 11 - Operating Revenue by Geographic Area (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| UNITED STATES | |||||||||||
| Operating revenues | $ 941,115 | $ 753,208 | $ 609,512 | ||||||||
| Long lived assets | $ 757,198 | $ 756,393 | 757,198 | 756,393 | 439,043 | ||||||
| CANADA | |||||||||||
| Operating revenues | 82,918 | 102,106 | 115,678 | ||||||||
| Long lived assets | 58,414 | 76,025 | 58,414 | 76,025 | 65,719 | ||||||
| MEXICO | |||||||||||
| Operating revenues | 41,323 | 45,442 | 34,121 | ||||||||
| Long lived assets | 32,070 | 25,100 | 32,070 | 25,100 | 18,868 | ||||||
| Operating revenues | 264,262 | $ 259,574 | $ 275,399 | $ 266,121 | 253,267 | $ 231,702 | $ 222,371 | $ 193,416 | 1,065,356 | 900,756 | 759,311 |
| Long lived assets | $ 847,682 | $ 857,518 | $ 847,682 | $ 857,518 | $ 523,630 | ||||||