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Note 7 - Revenue 2 (Details Textual) $ in Millions	Jun. 30, 2024 USD ($)
Contract Capacity [Member] | Hoosier [Member]
Revenue, Remaining Performance Obligation, Amount	$ 186.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Energy Obligations [Member]
Revenue, Remaining Performance Obligation, Amount	$ 207.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	6 months
Revenue, Remaining Performance Obligation, Percentage	30.30%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Energy Obligations [Member] | Hoosier [Member]
Revenue, Remaining Performance Obligation, Amount	$ 83.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Contract Capacity [Member]
Revenue, Remaining Performance Obligation, Amount	$ 151.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	5 years 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Contract Capacity [Member] | Hoosier [Member]
Revenue, Remaining Performance Obligation, Amount	$ 30.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Additional Obligations [Member]
Revenue, Remaining Performance Obligation, Amount	$ 152.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	5 years 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Coal Sales [Member]
Revenue, Remaining Performance Obligation, Amount	$ 154.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Contract Capacity [Member] | Hoosier [Member]
Revenue, Remaining Performance Obligation, Amount	$ 60.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

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X

- 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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- Details

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