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Note 15 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 | Dec. 31, 2020 USD ($)
Number of Vessels, Held for Sale | 20 |  | 46 | 23
Number of Vessels, Held for Sale, Addition,Percentage |  |  | 20.00% |
Number of Vessels, Held for Sale, Addition |  | 0 |  | 32
Number of Vessels, Held for Sale, Sold | 3 | 8 |  | 53
Asset Held For Sale, Net Book Value | $ 31,200 |  |  | $ 34,400
Proceeds from Sale of Assets | 11,000 | $ 9,500 |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | $ (1,948) | 5,331 |  |
Impairment of Long-Lived Assets to be Disposed of |  | $ 10,200 |  |
Number of Additional Vessels to be Sold | 0 |  |  |
Impairment of Assets Transferred to Held for Sale | $ 0 |  |  |

X
- Definition Represents assets held for sale at net book value. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets transferred to held for sale. + References No definition available. + Details
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- Definition The number of additional vessels to be sold. + References No definition available. + Details
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- Definition The number of vessels classified as held for sale. + References No definition available. + Details
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- Definition The number of vessels are classified as held for sale during period. + References No definition available. + Details
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- Definition The percentage of vessels held for sale to total vessels owned during period. + References No definition available. + Details
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- Definition The number of vessels classified as held for sale are sold during period. + References No definition available. + Details
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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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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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