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Note 15 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Number of Vessels, Held for Sale | 14 | 14 |  | 23 | 46
Number of Vessels, Held for Sale, Addition |  | 2 |  | 32 |
Number of Vessels, Held for Sale, Sold |  | 9 |  | 53 |
Asset Held For Sale, Net Book Value |  | $ 17,900 |  | $ 34,400 |
Number of Vessels, Held for Sale, Reactivation |  | 2 |  |  |
Number of Active Vessels Sold |  | 10 | 3 |  |
Proceeds from Sale of Productive Assets, Total |  | $ 33,956 | $ 31,498 |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  | (3,000) | 7,500 |  |
Proceeds from Sale of Vessels |  | 34,000 |  |  |
Impairment of Assets Transferred to Held for Sale |  | 1,900 | 65,700 |  |
Impairment Charge Recaptured | $ 1,700 |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  | 1,900 | $ 1,900 |  |
Third-party Operator, Family Member of Director [Member] |  |  |  |  |
Proceeds from Sale of Productive Assets, Total |  | 11,400 |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  | $ 4,300 |  |  |

X
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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + 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=123570139&loc=d3e3602-108585 + Details
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