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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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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