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Note 17 - Discontinued Operations (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 30, 2018 | Dec. 31, 2018
Eurodry [Member] | Vessel Acquisition [Member] |  |
Related Party Transaction, Amounts of Transaction |  | $ 52,520,000
Eurodry [Member] | Allocated Equity from Accumulated Deficit [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 9,660,000
Eurodry [Member] | Allocated Equity to Equity [Member] |  |
Related Party Transaction, Amounts of Transaction |  | $ 42,860,000
Eurodry [Member] |  |
Common Stock, Value, Received | $ 2,254,830 |
Eurodry [Member] | Series B Preferred Stock [Member] |  |
Preferred Stock, Shares, Received (in shares) | 19,042 |

X
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