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Note 5 - Investment in Unconsolidated Affiliates (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 22, 2021 | Jun. 22, 2020 | Jun. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2022
Due from Affiliate, Current |  |  |  | $ 0 | $ 70,134 |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  | 0 | 400 | $ 52,981 |
Due to Affiliate, Current |  |  |  | 0 | 61,555 |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  | 647,684 | 371,033 | 397,038 |
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |
Dividends, Total |  |  | $ 35,000 |  |  |  |
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 51.00%
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |
Due from Affiliate, Current |  |  |  |  | 49,000 |  |
Proceeds from Dividends Received |  | $ 17,200 |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  | $ (0) | 400 | 40,900 |
Due to Affiliate, Current |  |  |  |  | 40,400 |  |
Sonatide Marine Ltd [Member] | ANGOLA |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  |  | $ 43,200 | $ 45,300 |
Sales Revenue Services Percentage |  |  |  |  | 11.90% | 11.70% |
Number of Vessels |  |  |  |  | 24 | 23 |
Number of Stacked Vessels |  |  |  |  | 5 | 6 |
Sonatide Marine Ltd [Member] | Sonangol [Member] |  |  |  |  |  |  |
Proceeds from Dividends Received |  | $ 17,800 |  |  |  |  |
DTDW [Member] |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  |  |  | $ 12,100 |
Number of Vessels |  |  |  |  | 1 |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 40.00% |  |
Equity Method Investment, Ownership Percentage by Other Owners |  |  |  |  | 60.00% |  |
Secured Long-term Debt, Noncurrent |  |  |  |  |  | 4,700 |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  | $ 2,000 |
Payments To Settle Debt Guarantee | $ 2,000 |  |  |  |  |  |

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