Note 1 - General Business (Details Textual) |
6 Months Ended |
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Jun. 30, 2023 | |
Number of Reportable Segments | 2 |
Southwestern Indiana [Member] | |
Number of Underground Mines Included in the Significant Operating Segment | 2 |
Sunrise Energy, LLC [Member] | |
Equity Method Investment, Ownership Percentage | 50.00% |
X | ||||||||||
- Definition Represents the number of underground mines that are included in the significant operating segment. No definition available.
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X | ||||||||||
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X | ||||||||||
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X | ||||||||||
- Details
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X | ||||||||||
- Details
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