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Note 6 - Revenue 1 (Details Textual) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Jan. 01, 2023 | Jan. 01, 2021
Coal [Member] |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total |  |  |  | $ 12.8
Contract with Customer, Liability |  |  | $ 8.9 |
Contract with Customer, Liability, Revenue Recognized | $ 2.5 |  |  |
Coal [Member] | Geographic Concentration Risk [Member] | INDIANA | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk, Percentage | 52.00% | 87.00% |  |
Electric Operations [Member] |  |  |  |
Contract with Customer, Liability |  |  | $ 26.6 |
Contract with Customer, Liability, Revenue Recognized | $ 16.0 |  |  |
Electric Operations [Member] | Geographic Concentration Risk [Member] | INDIANA | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk, Percentage | 100.00% |  |  |

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