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Note 7 - Affiliates Balances (Details Textual) $ in Thousands, Kz in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 22, 2021 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 | Mar. 31, 2021 AOA (Kz)
Number of Vessels |  | 146 |  | 149 |
Repayments of Secured Debt |  | $ 26,414 | $ 2,600 |  |
Sonatide [Member] |  |  |  |  |
Due From Affiliate, Net of Due to Affiliate |  | 6,100 |  |  |
Cash, Ending Balance |  | 9,500 |  |  | Kz 1
Accounts Receivable, after Allowance for Credit Loss, Current, Total |  | $ 9,200 |  |  |
DTDW [Member] |  |  |  |  |
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 |  |  |
DTDW [Member] | Subsequent Event [Member] |  |  |  |  |
Repayments of Secured Debt | $ 2,000 |  |  |  |

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