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Note 2 - Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 0 | $ 0 | $ 0
Estimated Salvage Value Per Light Weight Ton of Vessel | 250 | 250 |
Ship Owning Crew Contract Term (Month) | 9 months |  |
Number of Reportable Segments | 1 |  |
Minimum [Member] |  |  |
Lessor, Operating Lease, Term of Contract (Year) | 10 years |  |
Maximum [Member] |  |  |
Lessor, Operating Lease, Term of Contract (Year) | 4 years |  |
Lessor, Operating Lease, Option to Renewal Term (Month) | 12 months |  |
Vessels [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 25 years |  |

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