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Note 6 - Leases (Details Textual) |  |  |  |  | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 10, 2020 USD ($) | Dec. 10, 2020 USD ($) | Dec. 20, 2019 | Mar. 31, 2015 USD ($) | Jan. 29, 2015 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2022 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  | $ (0) | $ 48,140,000 | $ (0) |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  | $ 45,222,000 | 0 |  |  |
Operating Lease, Weighted Average Remaining Lease Term (Month) |  |  |  |  |  |  | 59 months 6 days |  |  |  |
M/T Eco Bel Air and M/T Eco Beverly Hills [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Time Charters |  |  |  |  |  |  | 2 |  |  |  |
M/T Nord Valiant [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Time Charters |  |  |  |  |  |  | 1 |  |  |  |
M/T Eco Los Angeles and M/T Eco City of Angels [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Time Charters |  |  |  |  |  |  | 2 |  |  |  |
M/T Eco Marina Del Ray [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Time Charters |  |  |  |  |  |  | 1 |  |  |  |
M/T Stenaweco Energy and M/T Stenaweco Evolution Sale Leaseback [Member] |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Lease Term (Year) |  |  |  | 7 years |  |  |  |  |  |  |
M/T Stenaweco Energy Sale Leaseback [Member] |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Rent Expense, Per Day |  |  |  | $ 8,625 | $ 8,586 |  |  |  |  |  |
M/T Stenaweco Energy, M/T Stenaweco Evolution, and M/T Stenaweco Excellence [Member] |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Buyback Period, Minimum Term (Year) |  |  |  | 3 years |  |  |  |  |  |  |
Sale Leaseback Transaction, Buyback Period, Maximum Term (Year) |  |  |  | 7 years |  |  |  |  |  |  |
M/T Stenaweco Energy and the M/T Stenaweco Evolution [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Vessel Purchase Options Exercised |  |  | 2 |  |  |  |  |  |  |  |
M/T Stenaweco Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  | $ 24,063,000 | $ 23,871,000 |  |
M/T Eco Beverly Hills and M/T Eco Bel Air [Member] |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Lease Term (Year) |  | 5 years |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Minimum Liquidity Requirement |  |  |  |  |  | $ 4,000,000 |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 45,425,000 | $ 45,425,000 |  |  |  |  |  |  |  |  |
Operating Lease, Liability, Total | 43,759,000 | $ 43,759,000 |  |  |  |  |  |  |  |  |
Operating Lease, Cost | 1,666,000 |  |  |  |  |  |  |  |  |  |
Sale and Leaseback Transaction, Gain (Loss), Net | $ (340,000) |  |  |  |  |  | $ (10,688,000) |  |  |  |
Lessee, Operating Lease, Discount Rate | 6.72% | 6.72% |  |  |  |  |  |  |  |  |
Operating Lease, Payments |  |  |  |  |  |  | $ 877,000 |  |  |  |
M/T Eco Beverly Hills and M/T Eco Bel Air [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Rent Expense, Per Day |  |  |  |  |  | $ 10,000 |  |  |  | $ 14,000 | $ 16,750

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- Definition Term of the sale leaseback arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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