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Note 11 - Fair Value of Financial Instruments and Derivative Instruments (Details Textual) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
May 07, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Assets Held-for-sale, Not Part of Disposal Group, Current, Total |  | $ 25,887 | $ 24,340
Vessels [Member] |  |  |
Assets Held-for-sale, Not Part of Disposal Group, Current, Total |  | 27,047 |
Assets Held-for-sale, Long Lived, Fair Value Disclosure |  | 25,887 |
Impairment of Long-Lived Assets to be Disposed of |  | $ 1,160 |
Class B Warrants [Member] |  |  |
Class of Warrant or Right, Expired During Period (in shares) | 4,200,000 |  |
Class of Warrant or Right, Expired, Number of Securities Called by Warrants or Rights (in shares) | 168,000 |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 0 |

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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