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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Insurance and claims | $ 10,970 | $ 10,269
Net operating loss carryovers | 7,759 | 25,849
Tax credits | 11,395 | 10,942
Leased liability | 9,969 | 15,668
Finance lease obligation | 3,848 | 8,483
State bonus | 4,860 | 6,576
Other | 4,917 | 2,160
Valuation allowance | (242) | (385)
Total deferred tax assets | 53,476 | 79,562
Deferred tax liabilities: |  |
Property and equipment | (78,682) | (97,066)
Investment in partnership | (31,585) | (36,669)
ROU Asset- leases | (9,697) | (15,280)
Other | (4,353) | (7,462)
Sec. 481(a) - finance leases | (588) | (449)
Prepaid expenses | (3,124) | (2,966)
Total deferred tax liabilities | (128,029) | (159,892)
Net deferred tax liability | $ (74,553) | $ (80,330)

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