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Note 4(b) - Vessels, Net (Details Textual) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 03, 2020 | Oct. 29, 2020 | Nov. 20, 2019 | Nov. 18, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  | $ (0) | $ 48,140 | $ (0)
M/T Stenaweco Energy [Member] |  |  |  |  |  |  |
Payment to Purchase of Vessel |  |  |  | $ 23,953 |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  | $ 19,808 |  | $ 2,477 |  |  |
M/T Stenaweco Evolution [Member] |  |  |  |  |  |  |
Payment to Purchase of Vessel |  |  | $ 24,187 |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | $ 22,570 |  | $ 1,323 |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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