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Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Millions |  | 19 Months Ended | 31 Months Ended
--- | --- | --- | ---
Oct. 21, 2022 | May 31, 2023 | Dec. 31, 2025
Hoosier Energy [Member] | Forecast [Member] |  |  |
Purchase of Plant’s Energy and Capacity, Percentage |  | 100.00% |
Purchase of Plant’s Energy Output, Percentage |  |  | 22.00%
Purchase of Plant’s Capacity, Percentage |  |  | 32.00%
Hoosier Energy Acquisition [Member] | Subsequent Event [Member] |  |  |
Business Combination, Consideration Transferred, Total | $ 20.0 |  |
Long-Term Contract for Purchase of Electric Power, Term (Year) | 3 years 6 months |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | $ 17.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue | 39.0 |  |
Hoosier Energy Acquisition [Member] | Subsequent Event [Member] | Inventories [Member] |  |  |
Business Combination, Consideration Transferred, Total | $ 5.4 |  |

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