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Note 16 - Financial Instruments (Details Textual) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 USD ($) | Dec. 20, 2016
Vessel Profit Participation Liability, Noncurrent |  |  | $ 1,067,500 |  |  |
Asset Impairment Charges, Total |  |  |  | $ 4,595,819 |  |
Long-term Debt, Fair Value |  | 87,100,000 |  |  |  |
Difference Between Fair Value and Carrying Value |  | 3,100,000 |  |  |  |
Long-term Debt, Total |  | $ 90,200,000 |  |  |  |
M/V Monika P. [Member] |  |  |  |  |  |
Profit Sharing Agreement, Percentage |  |  |  |  |  | 35.00%
Vessel Profit Participation Liability, Noncurrent |  |  | $ 1,067,500 |  | $ 950,000 |
Assets Held-for-sale, Not Part of Disposal Group, Total | $ 8,230,000 |  |  |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 5,000,000 |  |  |  |  |
Estimated cost to sell, property | 100,000 |  |  |  |  |
Asset Impairment Charges, Total | 3,330,000 |  |  |  |  |
M/V Aggeliki P. [Member] |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group, Total | 5,390,000 |  |  |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 4,300,000 |  |  |  |  |
Estimated cost to sell, property | 170,000 |  |  |  |  |
Asset Impairment Charges, Total | $ (1,260,000) |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  |  | 1 |  |  |
Derivative, Notional Amount |  |  | $ 10,000,000 |  |  |

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- Definition Percentage of the fair market value of the vessel, over the outstanding loan, that will be shared with the bank that financed the vessel, when the vessel is sold or when the loan matures. + References No definition available. + Details
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