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v3.20.4

Note 5 - Investment in Unconsolidated Affiliates (Details Textual) $ in Thousands, Kz in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 22, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 AOA (Kz)
Due from Affiliate, Current |  |  | $ 62,050 | $ 125,972 |  |
Assets, Current, Total |  |  | 388,649 | 537,296 |  |
Asset Impairment Charges, Total |  |  | 74,109 | 37,773 | $ 61,132 |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  | 52,981 | 0 | 0 |
Due to Affiliate, Current |  |  | 53,194 | 50,186 |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  | 397,038 | 486,549 | 406,520 |
Sonatide Marine Ltd [Member] |  |  |  |  |  |
Dividends, Total |  | $ 35,000 |  |  |  |
Cash, Ending Balance |  |  | 9,400 |  |  | Kz 1.6
Accounts Receivable, after Allowance for Credit Loss, Current, Total |  |  | 9,800 |  |  |
Assets, Current, Total |  |  | 19,200 |  |  |
Sonatide Marine Ltd [Member] |  |  |  |  |  |
Due from Affiliate, Current |  |  | 41,600 | 89,200 |  |
Proceeds from Dividends Received | $ 17,200 |  |  |  |  |
Asset Impairment Charges, Total |  |  |  |  | 20,000 |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  | 40,900 | (0) | $ 20,083 |
Due to Affiliate, Current |  |  | $ 32,800 | $ 31,500 |  |
Number of Stacked Vessels |  |  | 2 |  |  |
Sonatide Marine Ltd [Member] | ANGOLA |  |  |  |  |  |
Number of Stacked Vessels |  |  | 6 | 13 | 16 |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  | $ 45,300 | $ 52,100 | $ 59,000 |
Sales Revenue Services Percentage |  |  | 11.70% | 10.90% | 15.00% |
Number of Vessels |  |  | 23 | 32 | 37 |
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% |  |  | 40.00%
Equity Method Investment, Ownership Percentage by Other Owners |  |  | 60.00% |  |  | 60.00%
Secured Long-term Debt, Noncurrent |  |  | $ 4,700 |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  | $ 2,000 |  |  |

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