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Note 6 - Revenue 1 (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accounts Receivable, after Allowance for Credit Loss, Total | $ 14,300,000 |
Contract Capacity [Member] |  |
Contract with Customer, Liability | $ 23,100,000 |
Coal [Member] | INDIANA | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk [Member] |  |
Concentration Risk, Percentage | 33.00% | 74.00%
Delivered Energy [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 211,800,000 | $ 53,900,000
Capacity Payments [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 56,100,000 | $ 12,300,000
Electricity, Purchased [Member] | Hoosier [Member] |  |
Long-Term Purchase Commitment, Minimum Quantity Required, Percentage | 70.00% |
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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