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Note 4 - Investment in Unconsolidated Affiliates (Details Textual) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 22, 2021 USD ($) | Jun. 22, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2022
Due from Affiliate, Current |  |  |  | $ 70,134 | $ 62,050 |  |
Assets, Current, Total |  |  |  | 342,672 | 388,649 |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  | 400 | 52,981 | $ 0 |
Due to Affiliate, Current |  |  |  | 61,555 | 53,194 |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  | 371,033 | 397,038 | 486,549 |
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |
Dividends, Total |  |  | $ 35,000 |  |  |  |
Sonatide Marine Ltd [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 51.00%
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |
Due from Affiliate, Current |  |  |  | 49,000 | 41,600 |  |
Proceeds from Dividends Received |  | $ 17,200 |  |  |  |  |
Cash, Ending Balance |  |  |  | 10,200 |  |  |
Accounts Receivable, after Allowance for Credit Loss, Current, Total |  |  |  | 10,600 |  |  |
Assets, Current, Total |  |  |  | 20,800 |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  | 400 | 40,900 | $ (0) |
Due to Affiliate, Current |  |  |  | $ 40,400 | $ 32,800 |  |
Number of Stacked Vessels |  |  |  |  | 2 |  |
Sonatide Marine Ltd [Member] | ANGOLA |  |  |  |  |  |  |
Number of Stacked Vessels |  |  |  | 5 | 6 | 13 |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  | $ 43,200 | $ 45,300 | $ 52,100 |
Sales Revenue Services Percentage |  |  |  | 11.90% | 11.70% | 10.90% |
Number of Vessels |  |  |  | 24 | 23 | 32 |
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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