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Note 7 - Revenue 1 (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) MWh | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jan. 01, 2023 USD ($)
Contract Capacity [Member] |  |  |  |
Contract with Customer, Liability | $ 39,800,000 | $ 39,800,000 |  |
Additional Obligations [Member] |  |  |  |
Contract with Customer, Liability | 45,000,000 | 45,000,000 |  |
Coal [Member] |  |  |  |
Accounts Receivable, after Allowance for Credit Loss |  |  |  | $ 16,300,000
Hoosier [Member] |  |  |  |
Long Term Purchase Agreement, Prepaid Contract Amount | $ 45,000,000 |  |  |
Long Term Purchase Commitment, Total Usage of Power, Megawatt Per Hour (Megawatt-Hour) | MWh | 1,302,480 |  |  |
Hoosier [Member] | Contract Capacity [Member] |  |  |  |
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour |  | 56 |  |
Revenue, Remaining Performance Obligation, Amount | $ 186,600,000 | 186,600,000 |  |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Price Per Kilowatts-month |  | $ 7.02 |  |
Hoosier [Member] | Electricity, Purchased [Member] |  |  |  |
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour |  |  | $ 34 |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year One |  | 917 |  |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year Two Through Four |  | 300 |  |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Price Per Kilowatts-month |  | $ 5.8 |  |

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