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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 20,029 | $ 26,570
Power contracts | 23,302 | 34,233
Compensation | 2,287 | 1,344
Accrued liabilities | 570 | 556
Other | 2,016 | 471
Total deferred tax assets | 48,204 | 63,174
Valuation allowance |  | (3,681)
Deferred tax assets, net of valuation allowance | 48,204 | 59,493
Coal properties | (25,764) | (27,700)
Power properties | (31,126) | (35,702)
Investment partnerships | (549) | (494)
Other |  | (203)
Total deferred tax liabilities | (57,439) | (64,099)
Net deferred tax liability | $ (9,235) | $ (4,606)

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