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Note 15 - Preferred Shares (Details Textual) - USD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2021 | Jun. 10, 2019 | Jan. 29, 2019 | May 30, 2018 | Jan. 27, 2014 | Jan. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Preferred Stock, Value, Distributed |  |  |  |  |  |  |  | $ 18,192,131 |
Preferred Stock Distributed (in shares) |  |  |  |  |  |  |  | 19,042 |
Payments for Repurchase of Redeemable Preferred Stock |  |  |  |  |  |  | $ 11,686,000 |  |
Dividends, Paid-in-kind, Total |  |  |  |  |  |  | 78,640 | 1,335,733 | 1,808,811
Dividends, Preferred Stock, Total |  |  |  |  |  |  | $ 1,271,782 | 1,335,733 | 1,808,811
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  |  | $ 29,000,000 |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) |  |  |  |  | $ 1,000 |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 4.00% |  |  |  |  | 8.00% |  |
Preferred Stock Additional Cash Dividend Under Specified Conditions Percentage |  |  |  |  | 40.00% |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share (in dollars per share) |  |  |  |  | $ 15.58 |  |  |  |
Payments for Repurchase of Redeemable Preferred Stock |  | $ 11,700,000 |  |  |  |  |  |  |
Percentage of Outstanding Preferred Stock Redeemed |  | 59.40% |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  | $ 8,000,000 |  |  |  |  |  |  |
Preferred Stock Deemed Dividend |  |  |  |  |  |  | $ 504,577 |  |
Dividends, Paid-in-kind, Total |  |  |  |  |  |  | 80,000 | 1,340,000 | 1,810,000
Dividends, Preferred Stock, Total |  |  |  |  |  |  | 1,270,000 |  |
Dividends, Preferred Stock, Cash |  |  |  |  |  |  | 1,030,000 |  |
Dividends Payable |  |  |  |  |  |  | 160,000 |  |
Preferred Stock, Redemption Amount |  |  |  |  |  |  | $ 8,000,000 |  |
Preferred Stock Voting Percentage of Number of Shares Convertible of Common Stock |  |  |  |  |  |  | 50.00% |  |
Series B Preferred Stock [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 14.00% |  |  |  |  | 14.00% |  |  |
Series B Preferred Stock [Member] | Maximum [Member] | First Five Years [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 5.00% |  |  |  |
Series B Preferred Stock [Member] | Maximum [Member] | Next Two Years [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 12.00% |  |  |  |  |  |
Series B Preferred Stock [Member] | Maximum [Member] | After Two Years [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 14.00% |  |  |  |  |  |
Ordinary Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Distributed |  |  |  |  |  |  |  | 14,500,000 |
Preferred Stock Issued as Dividends [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Distributed |  |  |  |  |  |  |  | 3,692,131 |
TCP [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 25,000 |  |  |  |
Friends Investment Company Inc. [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 5,700 |  |  |  |
Eurodry [Member] |  |  |  |  |  |  |  |  |
Percentage of Preferred Stock Outstanding |  |  |  |  |  |  | 50.00% |  |
Preferred Stock, Value, Distributed |  |  |  |  |  |  |  | $ 18,192,131 |
Common Stock, Value, Distributed |  |  |  | $ 2,254,830 |  |  |  |  |
Eurodry [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock Distributed (in shares) |  |  |  | 19,042 |  |  |  |  |
Eurodry [Member] | Ordinary Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Distributed |  |  |  | $ 14,500,000 |  |  |  |  |
Eurodry [Member] | Preferred Stock Issued as Dividends [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Distributed |  |  |  | $ 3,692,131 |  |  |  |  |

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