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Note 11 - Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024
Number of Vessels |  | 209 |  | 211
Proceeds from Sale of Productive Assets |  | $ 12,288 | $ 14,868 |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  | $ 8,598 | $ 13,090 |
Vessel [Member] |  |  |  |
Number of Vessels Sold |  | 10 | 4 |
Proceeds from Sale of Productive Assets |  | $ 12,300 | $ 14,900 |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  | 8,600 | $ 13,100 |
Payments to Acquire Productive Assets | $ 4,900 |  |  |
Bareboat Charter Agreement [Member] |  |  |  |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization | $ 19,900 | $ 19,900 |  |

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