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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Insurance and claims | $ 9,593 | $ 8,797
Net operating loss carryovers | 10,260 | 4,755
Tax credits | 11,985 | 11,875
Other | 8,350 | 4,414
Valuation allowance | (63) | (63)
Total deferred tax assets | 40,125 | 29,778
Deferred tax liabilities: |  |
Property and equipment | (87,939) | (76,325)
Investment in partnership | (26,066) | (14,197)
Deferred fuel hedge | (73) | (99)
Other | (569) |
Prepaid expenses | (2,945) | (2,501)
Total deferred tax liabilities | (117,592) | (93,122)
Net deferred tax liability | $ (77,467) | $ (63,344)

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