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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, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Vessels sold from active fleet |  |  | 10
Gain on sale of vessels | $ 8,701 | $ 250 | $ (2,901)
Total vessels sold/recycled | 7 | 12 | 9
Vessels Held for Sale [Member] |  |  |
Gain on sale of vessels | $ 3,088 | $ 5 | $ (6,209)
Vessels sold/recycled from assets held for sale | 8 | 12 | 9
Vessels, Active Fleet [Member] |  |  |
Vessels sold from active fleet | 7 | 2 | 10
Gain on sale of vessels | $ 5,613 | $ 553 | $ 3,499
Vessel [Member] |  |  |
Gain on sale of vessels | $ 8,701 | $ 558 | $ (2,710)
Total vessels sold/recycled | 15 | 14 | 19

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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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-3 + Details
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