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Note 8 - Assets 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, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Vessels sold from active fleet |  | 10 | 3
Gain on sale of vessels | $ 250 | $ (2,901) | $ 7,591
Vessels sold from assets held for sale |  |  | 53
Total vessels sold | 12 | 9 |
Vessels Held for Sale [Member] |  |  |
Gain on sale of vessels | $ 5 | $ (6,209) | $ 6,384
Vessels sold from assets held for sale | 12 | 9 | 53
Vessels, Active Fleet [Member] |  |  |
Vessels sold from active fleet | 2 | 10 | 3
Gain on sale of vessels | $ 553 | $ 3,499 | $ 1,217
Vessel [Member] |  |  |
Gain on sale of vessels | $ 558 | $ (2,710) | $ 7,601
Total vessels sold | 14 | 19 | 56

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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 https://asc.fasb.org/extlink&oid=126954810&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 https://asc.fasb.org/extlink&oid=126905981&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 https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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