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Note 7 - Affiliates Balances (Details Textual) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2021 USD ($) | Jun. 22, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 | Sep. 03, 2021 USD ($) | Apr. 21, 2021 USD ($)
Accounts Receivable, Credit Loss Expense (Reversal) |  |  | $ 0 | $ 0 |  | $ (1,000) | $ 53,581 |  |  |
Number of Vessels |  |  |  |  |  | 139 |  | 149 |  |
Repayments of Secured Debt |  |  |  |  |  | $ 39,259 | $ 33,520 |  |  |
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Dividends Received |  | $ 17,200 |  |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  |  | $ 41,500 |  |  |  |  |
Sonatide [Member] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  |  |  | (1,000) |  |  |  |
Due From Affiliate, Net of Due to Affiliate |  |  | 8,600 |  |  | 8,600 |  |  |  |
Cash, Ending Balance |  |  |  |  |  |  |  |  | $ 11,200 |
Accounts Receivable, after Allowance for Credit Loss, Current, Total |  |  | $ 9,500 |  |  | $ 9,500 |  |  |  |
DTDW [Member] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  |  | 12,100 |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  |  | 40.00% |  |  |  |
Equity Method Investment, Ownership Percentage by Other Owners |  |  | 60.00% |  |  | 60.00% |  |  |  |
Number of Vessels |  |  |  |  |  | 1 |  |  |  |
Secured Long-term Debt, Noncurrent |  |  |  |  |  |  |  |  |  | $ 4,700
Repayments of Secured Debt | $ 2,000 |  |  |  |  |  |  |  |  |
Sonatide Marine Ltd [Member] |  |  |  |  |  |  |  |  |  |
Dividends, Total |  |  |  |  | $ 35,000 |  |  |  |  |
Sonangol [Member] | Sonatide Marine Ltd [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Dividends Received |  | $ 17,800 |  |  |  |  |  |  |  |

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