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Note 5 - Vessels, Net (Details Textual) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 23, 2022 USD ($) | May 03, 2022 USD ($) | Apr. 26, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jul. 06, 2023 USD ($) | Apr. 06, 2023 USD ($)
Property, Plant and Equipment, Net, Total |  |  |  |  | $ 267,626,155 | $ 216,570,426 |  |
Impairment, Long-Lived Asset, Held-for-Use | $ 13,800,000 |  |  |  |  |  |  |
Asset Pledged as Collateral [Member] | Loan Agreements [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net, Total |  |  |  |  | $ 239,800,000 |  |  |
Number of Vessels Used As Collateral |  |  |  |  | 12 |  |  |
Installation of WBT System Improvements on Vessel [Member] |  |  |  |  |  |  |  |
Payments for Improvements of Property, Plant and Equipment |  |  |  |  | $ 500,000 | 1,500,000 |  |
Installation of Smart Monitoring Systems Improvement on Vessels [Member] |  |  |  |  |  |  |  |
Payments for Improvements of Property, Plant and Equipment |  |  |  |  | 200,000 | 400,000 |  |
Installation of Energy Saving Devices [Member] |  |  |  |  |  |  |  |
Payments for Improvements of Property, Plant and Equipment |  |  |  |  | $ 1,700,000 |  |  |
M/V Seaspan Melbourne [Member] |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  | $ 17,500,000 |  |  |  |  |
Payments to Make Property, Plant and Equipment Available for Use |  |  | 179,130 |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Including Preparation Costs |  |  | 33,438,371 |  |  |  |  |
Seaspan Melbourne, Vessels [Member] |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  | 33,259,241 |  |  |  |  |
Seaspan Melbourne, In-place Attached Time Charter [Member] |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  | $ 15,759,241 |  |  |  |  |
M/V Seaspan Manila [Member] |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | $ 17,500,000 |  |  |  |
Payments to Make Property, Plant and Equipment Available for Use |  |  |  | 2,084,509 |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Including Preparation Costs |  |  |  | 32,124,715 |  |  |  |
Seaspan Manila, Vessels [Member] |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | 30,040,206 |  |  |  |
Seaspan Manila, In-place Attached Time Charter [Member] |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | $ 12,540,206 |  |  |  |
M/V Gregos [Member] |  |  |  |  |  |  |  |
Vessel Construction Costs |  |  |  |  |  |  |  | $ 42,356,864
M/V “Terataki” [Member] |  |  |  |  |  |  |  |
Vessel Construction Costs |  |  |  |  |  |  | $ 42,545,997 |
M/V Akinada Bridge [Member] |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  | $ 14,200,000 |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  | $ 5,200,000 |  |  |  |  |  |
M/V Akinada Bridge [Member] | Asset Held for Sale [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net, Total |  |  |  |  |  | 8,500,000 |  |
Inventory On Board |  |  |  |  |  | 400,000 |  |
M/V Akinada Bridge [Member] | Liability Associated With Asset Held for Sale [Member] |  |  |  |  |  |  |  |
Advance Collected for Sale of Vessels |  |  |  |  |  | $ 3,600,000 |  |
Vessels Unencumbered [Member] |  |  |  |  |  |  |  |
Number of Vessels Unencumbered |  |  |  |  | 7 |  |  |

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