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Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Jan. 06, 2021	Dec. 31, 2020	Apr. 24, 2020	Mar. 12, 2020
Contractual Obligation, Total		$ 182,016
Performance Guarantee [Member]
Guarantor Obligations, Secured Loan Facility				$ 37,660
Performance Guarantee [Member] | M/T Eco Yosemite Park [Member]
Guarantor Obligations, Secured Loan Facility				18,830
Performance Guarantee [Member] | M/T Eco Joshua Park [Member]
Guarantor Obligations, Secured Loan Facility				$ 18,830
The 2020 Joint Venture [Member]
Equity Method Investment, Ownership Percentage			50.00%
Subsequent Event [Member]
Contractual Obligation, Total	$ 211,171
Contractual Obligation, to be Paid, Year One	116,434
Contractual Obligation, to be Paid, Year Two	$ 94,737
Subsequent Event [Member] | M/T Legio X Equestris [Member]
Interest in Vessel, Percentage	35.00%
Subsequent Event [Member] | M/T Julius Caesar [Member]
Interest in Vessel, Percentage	35.00%
Eco Van Nuys [Member]
Contractual Obligation, Total		30,060
Eco Santa Monica [Member]
Contractual Obligation, Total		30,060
Eco Venice Beach [Member]
Contractual Obligation, Total		30,060
Eco West Coast [Member]
Contractual Obligation, Total		42,857
Eco West Coast [Member] | Subsequent Event [Member]
Contractual Obligation, Total	$ 42,857
Eco Malibu [Member]
Contractual Obligation, Total		$ 48,979
Eco Malibu [Member] | Subsequent Event [Member]
Contractual Obligation, Total	48,979
M/T Eco Oceano Ca [Member] | Subsequent Event [Member]
Contractual Obligation, Total	60,150
M/T Julius Caesar [Member] | Subsequent Event [Member]
Contractual Obligation, Total	28,035
M/T Legio X Equestris [Member] | Subsequent Event [Member]
Contractual Obligation, Total	$ 31,150

X

- Definition

Represents guarantor's obligations under the guarantee or each group of similar guarantees for secured loan facility.

+ References

No definition available.

+ Details

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X

- Definition

Represents the reporting entity's interest in a vessel, expressed as a percentage.

+ References

No definition available.

+ Details

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X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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X

- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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