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Note 4 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Insurance premiums | $ 1,831 |  | $ 3,057
Contract assets | 1,823 |  |
Other | 2,971 |  | 2,786
| 19,924 | $ 22,255 | 19,810
Tires In Service [Member] |  |  |
Prepaid expenses | 5,011 |  | 4,787
License Fees Member [Member] |  |  |
Prepaid expenses | 4,760 |  | 4,858
Parts And Tires Inventory [Member] |  |  |
Prepaid expenses | $ 3,528 |  | $ 4,322

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