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Note 2 - Details of Consolidated Balance Sheet Accounts | 12 Months Ended
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Dec. 31, 2015
Notes to Financial Statements |
Supplemental Balance Sheet Disclosures [Text Block] | 2. Details of Consolidated Balance Sheet Accounts Prepaid expenses and other: As of December 31, prepaid expenses and other consisted of the following:
(In thousands) |  | 20 15 |  |  | 2014 |
Tires in service |  | $ | 5,064 |  |  | $ | 4,438 |
License fees |  |  | 4,921 |  |  |  | 4,397 |
Parts and tires inventory |  |  | 4,011 |  |  |  | 3,754 |
Insurance premiums |  |  | 1,730 |  |  |  | 1,537 |
Other |  |  | 2,408 |  |  |  | 2,734 |
|  | $ | 18,134 |  |  | $ | 16,860 |
Accrued liabilities: As of December 31, accrued liabilities consisted of the following:
(In thousands) |  | 2015 |  |  | 2014 |
Accrued expenses |  | $ | 7,940 |  |  | $ | 5,536 |
Vacation |  |  | 4,782 |  |  |  | 4,301 |
Accrued liability to MWL |  |  | 4,284 |  |  |  | 466 |
Salaries and wages |  |  | 2,644 |  |  |  | 1,204 |
Other |  |  | 1,984 |  |  |  | 1,203 |
|  | $ | 21,634 |  |  | $ | 12,710 |

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