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Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2011 USD ($)
Number of Vessels, Held for Sale, Addition |  |  |  | 7 | 32 | 46 |
Number of Vessels, Held for Sale, Addition,Percentage |  |  |  |  |  | 20.00% |
Number of Vessels, Held for Sale, Sold |  |  |  |  | 53 |  |
Number of Vessels, Transfer from Held for Sale to Active Fleet |  |  |  | 3 | 2 |  |
Number of Vessels, Held for Sale |  | 23 |  | 18 | 23 |  |
Number of Active Vessels Sold |  |  |  | 10 | 3 |  |
Number of Vessels Sold |  |  |  | 9 |  |  |
Proceeds from Sale of Productive Assets, Total |  |  |  | $ 34,010 | $ 38,296 | $ 28,847 |
Proceeds from Sale of Vessels and Other Assets |  |  |  | 34,000 | 38,300 |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | 13,700 | 75,200 | 26,700 |
Impairment Charge Recaptured |  |  |  | 1,700 | 1,000 |  |
Asset Impairment Charges, Total |  |  |  | 15,643 | 74,109 | 37,773 |
Other Assets, Total |  |  |  |  |  |  | $ 1,800
Unpaid Milestone Payments |  |  |  |  |  | 4,000 |
Impairment Charge On Under Construction Asset |  |  | $ 5,800 |  |  |  |
Expense Recovered on contract to Shipyard |  | $ 4,000 |  |  |  |  |
Vessel, Obsolete Inventory [Member] |  |  |  |  |  |  |
Asset Impairment Charges, Total |  |  | $ 5,200 | $ 1,905 | $ 2,959 | $ 5,223 |
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 Represents the impairment charge on a under construction asset. + References No definition available. + Details
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- Definition Amount of impairment charge recaptured during period. + References No definition available. + Details
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- Definition The number of vessels sold. + References No definition available. + Details
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