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Note 7 - Related Party Transactions (Details Textual) |  |  | 1 Months Ended | 2 Months Ended | 11 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jan. 01, 2011 | Aug. 31, 2019 USD ($) shares | Dec. 31, 2019 USD ($) | Nov. 15, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 EUR (€) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2018 USD ($) | Nov. 01, 2019 USD ($) | Sep. 30, 2019 USD ($)
Service Management Costs Daily Fee Related Party | € |  |  |  |  |  |  | € 685 |  | € 685 |  | € 685 |  |  |
Related Party Agreement Term (Year) | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction Discount Percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction Daily Fee Per Vessel Per Day in Operation |  |  |  |  |  | $ 720 |  |  |  |  |  |  |  |
Related Party Transaction Daily Fee Per Vessel Per Day in Lay Up |  |  |  |  |  | 360 | € 342.50 |  |  |  |  |  |  |
Due to Related Parties, Total |  |  |  | $ 795,562 |  | 795,562 |  | $ 2,672,895 |  |  |  | $ 2,672,895 |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  | $ 55,720,226 |  | 1,867 |  | $ 30,063,480 |  |  |  |
Four Feeder Containerships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Vessels Acquired |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
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 | 2,816,901 |  |  |  |  |  |  |
Eurobulk Ltd. [Member] | Fixed Management Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 2,000,000 | $ 1,250,000 |  |  |  |  |  |  | $ 2,000,000 |  |
Eurobulk Ltd. [Member] | Fixed Management Fees [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  | $ 1,344,250 |  | 1,561,126 |  | 1,306,476 |  |  |  |
Eurobulk Ltd. [Member] | Vessel Management Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  | $ 3,671,335 |  | 3,536,094 |  | 2,632,637 |  |  |  |
Colby Trading Ltd [Member] | First Debt Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to Related Parties, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00%
Colby Trading Ltd [Member] | Second Debt Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to Related Parties, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |
Eurochart [Member] | Vessel Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction Commission, Percentage |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  | $ 0 |  | 64,500 |  | 70,640 |  |  |  |
Eurochart [Member] | Charter Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction Commission, Percentage |  |  |  |  |  | 1.25% | 1.25% |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  | $ 493,341 |  | 453,361 |  | 310,467 |  |  |  |
Eurochart [Member] | Vessel Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  | 0 |  | 0 |  | 118,526 |  |  |  |
Sentinel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  | $ 106,749 |  | 118,684 |  | 89,329 |  |  |  |
Related Party Transaction Commission on Premium, Maximum, Percentage |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |
Technomar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  | $ 142,332 |  | $ 137,385 |  | $ 101,394 |  |  |  |
Related Party Transaction Amounts of Transaction Per Crew Member Per Month |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |

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