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Note 2 - Details of Consolidated Balance Sheet Accounts | 12 Months Ended
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Dec. 31, 2017
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) |  | 201 7 |  |  | 201 6 |
License fees |  | $ | 4,858 |  |  | $ | 5,042 |
Tires in service |  |  | 4,787 |  |  |  | 5,351 |
Parts and tires inventory |  |  | 4,322 |  |  |  | 4,350 |
Insurance premiums |  |  | 3,057 |  |  |  | 1,658 |
Other |  |  | 2,786 |  |  |  | 2,906 |
|  | $ | 19,810 |  |  | $ | 19,307 |
Accrued liabilities: As of December 31, accrued liabilities consisted of the following:
(In thousands) |  | 201 7 |  |  | 201 6 |
Accrued expenses |  | $ | 8,212 |  |  | $ | 12,903 |
Vacation |  |  | 5,621 |  |  |  | 5,353 |
Salaries and wages |  |  | 4,171 |  |  |  | 1,839 |
Accrued liability to MWL |  |  | 1,765 |  |  |  | 3,026 |
Other |  |  | 1,853 |  |  |  | 3,718 |
|  | $ | 21,622 |  |  | $ | 26,839 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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