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Note 13 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets: |  |
Loss carryforwards U.S. - Federal/States | $ 6,598 | $ 15,975
Asset retirement obligations | 6,359 | 5,175
Accrued expenses | 3,257 | 744
Stock-based compensation | 2,249 | 2,331
Total deferred tax assets | 18,463 | 24,225
Deferred tax liabilities: |  |
Depreciation & amortization | (54,100) | (30,631)
Net deferred tax liabilities | $ (35,637) | $ (6,406)

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