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Note 16 - Financial Instruments (Details Textual) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 12, 2021 USD ($) | Oct. 17, 2014
Impairment, Long-Lived Asset, Held-for-Use | $ 13,800,000 |  |  |  |  |  |
Depreciation |  |  | $ 22,835,469 | $ 18,522,217 | $ 7,203,198 |  |
Property, Plant and Equipment, Net, Total |  | $ 267,626,155 | 267,626,155 | $ 216,570,426 |  |  |
MV Jonathan P [Member] |  |  |  |  |  |  |
Impairment, Long-Lived Asset, Held-for-Use |  |  | 13,800,000 |  |  |  |
Depreciation |  | 200,000 |  |  |  |  |
Property, Plant and Equipment, Net, Total |  | $ 6,900,000 | $ 6,900,000 |  |  |  |
Interest Rate Swap [Member] | Eurobank [Member] |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  | 1 | 1 |  |  |  | 1
Derivative, Notional Amount |  | $ 20,000,000 | $ 20,000,000 |  |  | $ 10,000,000 |

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