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Note 10 - Commitments and Contingencies - Future Minimum Lease and Royalty Payments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Note 8 - Commitments and Contingencies - Future Minimum Lease and Royalty Payments (Details) |  |  |
Royalty Expense | $ 34.2 | $ 18.5 | $ 11.8
2023, Coal Lease and Royalty Obligations | 3.3 |  |
2024, Coal Lease and Royalty Obligations | 3.3 |  |
2025, Coal Lease and Royalty Obligations | 3.4 |  |
2026, Coal Lease and Royalty Obligations | 3.1 |  |
2027, Coal Lease and Royalty Obligations | 2.9 |  |
Thereafter, Coal Lease and Royalty Obligations | 11.1 |  |
Total minimum payments, Coal Lease and Royalty Obligations | $ 27.1 |  |

X
- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year. + References No definition available. + Details
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X
- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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X
- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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X
- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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X
- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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X
- Definition Amount of required minimum rental payments for coal lease and royalty obligations having an initial or remaining non-cancelable lease term in excess of one year due after fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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