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Note 6 - Equity - Common Stock (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 12, 2023 Vote D | Jun. 30, 2022 $ / T | Jun. 21, 2023
Class of Stock [Line Items] |  |  |
Percent of royalty fee income |  | 3.00% |
Price per ton of coal processed at preparation plants | $ / T |  | 5.00 |
Price per ton of loaded coal at rail load-out facilities | $ / T |  | 2.50 |
Percentage dividend from financial performance of carbon |  | 20 |
Threshold trading days volume weighted average price | D | 20 |  |
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per common share | Vote | 1 |  |
Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Distribution ratio |  |  | 0.2
Number of votes per common share | Vote | 1 |  |

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