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Note 4(c) - Assets Held for Sale (Details Textual) - USD ($)				12 Months Ended
	Jan. 21, 2020	Jan. 14, 2020	Dec. 12, 2019	Dec. 31, 2019	Dec. 31, 2020
Impairment of Long-Lived Assets to be Disposed of				$ 12,310,000
Assets Held-for-sale, Not Part of Disposal Group, Current, Total				43,271,000	$ 24,340,000
Inventory, Net, Total				848,000	514,000
MT Eco Fleet [Member]
Impairment of Long-Lived Assets to be Disposed of			$ 6,779,000
Assets Held-for-sale, Not Part of Disposal Group, Current, Total				20,667,000
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 21,000,000	$ 23,000,000
M/T Eco Revolution [Member]
Impairment of Long-Lived Assets to be Disposed of			$ 5,531,000
Assets Held-for-sale, Not Part of Disposal Group, Current, Total				22,604,000
Inventory, Net, Total				$ 124,000
Eco Van Nuys [Member]
Assets Held-for-sale, Not Part of Disposal Group, Current, Total					8,187
Eco Santa Monica [Member]
Assets Held-for-sale, Not Part of Disposal Group, Current, Total					8,146
Eco Venice Beach [Member]
Assets Held-for-sale, Not Part of Disposal Group, Current, Total					$ 8,007

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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-Paragraph 15
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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