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Note 12 - Subsequent Events (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 08, 2024 | May 07, 2024 USD ($) | Feb. 15, 2023 USD ($) | Jun. 30, 2022 | Jun. 30, 2024 $ / shares | Mar. 31, 2024 USD ($) | Feb. 01, 2024 $ / shares
Subsequent Events |  |  |  |  |  |  |
Percentage dividend from financial performance of carbon |  |  |  | 20 |  |  |
Class B Common Stock |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Dividend payable per share | $ / shares |  |  |  |  |  |  | $ 0.2416
Revolving Credit Facility |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 125.0 |  |  |  |
Accordion feature |  |  | $ 50.0 |  |  |  |
Initial aggregate revolving commitment |  |  |  |  |  | $ 106.8 |
Revolving Credit Facility | Secured overnight financing rate |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Interest rate, basis spread |  |  | 2.00% |  |  |  |
Revolving Credit Facility | Base Rate |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Interest rate, basis spread |  |  | 1.50% |  |  |  |
Subsequent Event | Secured overnight financing rate |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Interest rate, basis spread | 2.50% |  |  |  |  |  |
Subsequent Event | Base Rate |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Interest rate, basis spread | 2.00% |  |  |  |  |  |
Subsequent Event | Fed Funds Effective Rate Overnight Index Swap Rate | Minimum |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Interest rate, basis spread | 0.50% |  |  |  |  |  |
Subsequent Event | Fed Funds Effective Rate Overnight Index Swap Rate | Maximum |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Interest rate, basis spread | 3.00% |  |  |  |  |  |
Subsequent Event | Class A Common Stock |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Dividend payable per share | $ / shares |  |  |  |  | $ 0.1375 |  |
Subsequent Event | Class B Common Stock |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Dividend payable per share | $ / shares |  |  |  |  | $ 0.2376 |  |
Subsequent Event | Revolving Credit Facility |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Percentage dividend from financial performance of carbon |  | 20 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200.0 |  |  |  |  |
Accordion feature |  | $ 75.0 |  |  |  |  |

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