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Note 4 - Details of Consolidated Balance Sheet Accounts | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
Supplemental Balance Sheet Disclosures [Text Block] | 4 . 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 8 |  |  | 2017 |
Tires in service |  | $ | 5,011 |  |  | $ | 4,787 |
License fees |  |  | 4,760 |  |  |  | 4,858 |
Parts and tires inventory |  |  | 3,528 |  |  |  | 4,322 |
Insurance premiums |  |  | 1,831 |  |  |  | 3,057 |
Contract assets |  |  | 1,823 |  |  |  | — |
Other |  |  | 2,971 |  |  |  | 2,786 |
|  | $ | 19,924 |  |  | $ | 19,810 |
Accrued liabilities: As of December 31, accrued liabilities consisted of the following:
(In thousands) |  | 201 8 |  |  | 2017 |
Salaries and wages |  | $ | 9,744 |  |  | $ | 4,171 |
Accrued expenses |  |  | 7,091 |  |  |  | 8,212 |
Vacation |  |  | 5,895 |  |  |  | 5,621 |
Accrued liability to MWL |  |  | 1,222 |  |  |  | 1,765 |
Other |  |  | 4,214 |  |  |  | 1,853 |
|  | $ | 28,166 |  |  | $ | 21,622 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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