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Note 8 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Basis difference in fixed assets | $ 9,299 | $ 20,133
Foreign tax credit carryforward | 14,848 | 20,084
Net operating losses | 48,981 | 25,182
Foreign deferred tax assets, net of impact on U.S. taxes | 0 | 8,693
Asset retirement obligations | 8,531 | 8,546
Operating lease liabilities | 10,753 | 1,750
Basis difference in accrued liabilities | 3,800 | 402
Basis difference in receivables | 2,783 | 454
Other | 622 | 1,683
Total deferred tax assets | 99,617 | 86,927
Valuation allowance | (47,583) | (46,949)
Net deferred tax assets | 52,034 | 39,978
Basis difference in fixed assets | (97,825) | 0
Net deferred tax liabilities | $ (97,825) | $ 0

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