Note 6 - Leases (Details Textual) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)	Jun. 30, 2018
Operating Lease, Weighted Average Discount Rate, Percent	9.09%
Operating Lease, Weighted Average Remaining Lease Term	2 years 243 days
Operating Lease, Payments	$ 3,115
Stena Weco A/S [Member] \| M/T Stenaweco Energy, M/T Stenaweco Evolution, and M/T Stenaweco Excellence, M/T Stenaweco Elegance [Member]
Number of Time Charters		4
BP Shipping [Member] \| MT Eco Revolution, MT Eco Bel Air, and MT Eco Beverly Hills [Member]
Number of Time Charters		3
Shell Tankers Singapore Primate Limited [Member] \| MT Eco Palm Desert and MT Eco California [Member]
Number of Time Charters		2
Dampskibsselskabet Norden A/S [Member] \| M/T Nord Valiant [Member]
Number of Time Charters		1
Clearlake Shipping Pte Ltd [Member] \| MT Eco Fleet [Member]
Number of Time Charters		1
Cargill International SA [Member] \| M/T Eco Marina Del Ray [Member]
Number of Time Charters		1

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
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+ Details

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

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