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Note 8 - Asset Held for Sale, Asset Sales and Asset Impairments (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2011 USD ($)
Number of Vessels, Held for Sale, Addition |  | 46 | 32 |  |  |  |
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 |  |  |  | 2 |  |  |
Number of Vessels, Held for Sale | 23 |  | 23 | 23 |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | $ 75,200 |  |  |
Asset Impairment Charges, Total |  |  |  | 74,109 | $ 37,773 | $ 61,132 |
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 |  | $ 2,959 | $ 5,223 | $ 0 |

X
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