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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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Term of the sale leaseback arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of the per day expense recorded for use of the vessel in connection with the transaction involving the sale of vessel to another party and the lease of the vessel back to the seller.

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Discount rate used by lessee to determine present value of operating lease payments.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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