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Note 18 - Segment of Business - Summary of Reportable Segments Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Revenue | $ 634,480 | $ 361,991
Operating Expense | 65,012 | 30,430
Depreciation | 67,211 | 46,875
Amount attributable to assets acquired | 589,780 | 630,554
Capital Expenditures | 75,352 | 54,020
Coal Operations [Member] |  |
Revenue | 435,425 | 293,344
Operating Expense | 63,600 | 3,736
Depreciation | 48,365 | 43,612
Amount attributable to assets acquired | 376,387 | 376,228
Capital Expenditures | 56,521 | 50,367
Electric Operations [Member] |  |
Revenue | 268,341 | 66,316
Operating Expense | 12,552 | 31,505
Depreciation | 18,739 | 3,117
Amount attributable to assets acquired | 208,331 | 266,730
Capital Expenditures | 18,831 | 3,653
Corporate and Other [Member] |  |
Revenue | (69,286) | 2,331
Operating Expense | (11,140) | (4,811)
Depreciation | 107 | 146
Amount attributable to assets acquired | 5,062 | (12,404)
Capital Expenditures | $ 0 | $ 0

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