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Note 6 - Revenue 2 (Details Textual) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Fixed-Price Contract [Member] |  |
Revenue, Remaining Performance Obligation, Percentage | 55.00% |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Contracts with Price Reopeners [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |  | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Coal Sales [Member] |  |
Revenue, Remaining Performance Obligation, Amount | $ 155.0 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Energy Obligations [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) | 1 year |
Revenue, Remaining Performance Obligation, Amount | $ 186.6 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Energy Obligations [Member] | Hoosier [Member] |  |
Revenue, Remaining Performance Obligation, Amount | $ 115.6 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Contract Capacity [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) | 1 year |
Revenue, Remaining Performance Obligation, Amount | $ 144.6 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Contract Capacity [Member] | Hoosier [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) | 1 year |
Revenue, Remaining Performance Obligation, Amount | $ 41.6 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | Contract Capacity [Member] | Hoosier [Member] |  |
Revenue, Remaining Performance Obligation, Amount | $ 60.9 |

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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- Definition Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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