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Note 2 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Insurance premiums | $ 3,057 | $ 1,658
Other | 2,786 | 2,906
| 19,810 | 19,307
License Fees Member [Member] |  |
Prepaid expenses | 4,858 | 5,042
Tires In Service [Member] |  |
Prepaid expenses | 4,787 | 5,351
Parts And Tires Inventory [Member] |  |
Prepaid expenses | $ 4,322 | $ 4,350

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