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Note 6 - Income Taxes - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Reserves and accrued liabilities | $ 9,050 | $ 7,986
Other | 2,464 | 2,313
| 11,514 | 10,299
Deferred tax liabilities: |  |
Depreciation | 130,686 | 113,773
Prepaid expenses | 2,850 | 2,503
| 133,536 | 116,276
Net deferred tax liability | $ 122,022 | $ 105,977

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