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Note 8 - Asset Held for Sale, Asset Sales and Asset Impairments - Summary of Vessel Sales and Gains on Sales of Vessels (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Gain on sale of vessels | $ 7,591 | $ 2,263 | $ 10,624
Vessels sold from assets held for sale | 53 |  |
Vessels Held for Sale [Member] |  |  |
Gain on sale of vessels | $ 6,384 | $ 0 | $ 0
Vessels sold from assets held for sale | 53 | (0) | (0)
Vessels, Active Fleet [Member] |  |  |
Vessels sold from active fleet | 3 | 40 | 38
Gain on sale of vessels | $ 1,217 | $ 2,434 | $ 10,935
Vessel [Member] |  |  |
Gain on sale of vessels | $ 7,601 | $ 2,434 | $ 10,935
Total vessels sold | 56 | 40 | 38

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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