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Note 5 - Transactions With Related Parties (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Central Shipping Inc [Member] | Technical Management Fee [Member] |  |  |
Related Party Transaction, Amounts of Transaction | $ 428 | $ 350 |
Family Trading [Member] | Due to Related Parties [Member] |  |  |
Dividends Payable | 1,779 |  | $ 864
Family Trading [Member] | Series E Preferred Stock [Member] |  |  |
Dividends, Preferred Stock, Total | $ 915 |  |

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