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v3.20.1

Note 1 - Basis of Presentation and General Information (Details Textual) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Feb. 01, 2021 | Dec. 19, 2019 | Dec. 18, 2019 | Nov. 21, 2019 USD ($) $ / shares | Nov. 08, 2019 USD ($) | Jul. 29, 2019 USD ($) | Jun. 10, 2019 | Jan. 31, 2021 | Aug. 31, 2019 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | May 30, 2018 shares
Shareholders Ownership, Percentage |  |  |  |  |  |  |  |  |  | 62.00% |  |  |
Spinoff Transaction, Number of Eurodry Common Share Received by Company’s Shareholders for Every Five Common Shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 1
Spinoff Transaction, Number of Company’s Common Shares Exchanged for Each Common Share of Eurodry (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 5
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  | $ 55,720,226 | $ 1,867 | $ 30,063,480 |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  | $ 16,167,680 |  |  |  |
Working Capital Surplus |  |  |  |  |  |  |  |  |  | 18,600,000 |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total |  |  |  |  |  |  |  |  |  | 3,240,429 | $ (1,474,830) | $ 5,053,025 |
Cash, Ending Balance |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
Restricted Cash and Cash Equivalents, Total |  |  |  |  |  |  |  |  |  | $ 4,900,000 |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  | 4.00% |  |  | 8.00% |  |  |
Series B Preferred Stock [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 14.00% |  |  |  |  |  |  | 14.00% |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 8 | 8 |  |  |  |  |  |  |  |  |  |
Piraeus Bank S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  | $ 3,667,680 |  |  |  |  |  |  |
Piraeus Bank S.A. [Member] | Second Debt Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  | $ 32,000,000 |  |  |  |  |  |  |  |
Four Feeder Containerships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Vessels Acquired |  |  |  |  |  |  |  |  | 4 |  |  |  |
Consideration to Acquire Property, Plant and Equipment |  |  |  |  |  |  |  |  | $ 28,200,000 |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets (in shares) | shares |  |  |  |  |  |  |  |  | 2,816,901 | 2,816,901 |  |  |
Shares Issued, Percent of Outsanding Shares of the Company |  |  |  |  |  |  |  |  | 64.30% |  |  |  |
Synergy Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,056,338 |  |  |
Vessels Acquired During the Period |  |  |  | 4 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  | $ 5.68 |  |  |  |  |  |  |  |  |
Acquisition of Property, Plant and Equipment, Contingent Shares Issuable |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Synergy Vessels [Member] | Piraeus Bank S.A. [Member] | Second Debt Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |

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