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Note 4 - Vessels, Net (Details Textual) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 21, 2019 | Nov. 19, 2019 | Nov. 18, 2019 | Aug. 07, 2019 | Aug. 02, 2019 | Jun. 25, 2018 | Dec. 21, 2017 | Dec. 06, 2017 | Oct. 29, 2017 | Oct. 23, 2017 | Sep. 30, 2017 | Sep. 29, 2017 | Jun. 20, 2017 | Jan. 13, 2017 | Jan. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cost for Improvements of Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370,000 |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,255,735 | $ 9,552,260
Gain (Loss) on Disposition of Property Plant Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,340,952 | 803,811
Asset Impairment Charges, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,595,819
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,720,226 | $ 1,867 | 30,063,480
M/V Aggeliki P. and M/V Monika P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges, Total |  |  |  |  |  |  |  |  |  |  | $ 4,600,000 |  |  |  |  |  |  |
Impairment Effect on Earnings Per Share, Pretax (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 3.36 |  |  |  |  |  |  |
M/V Aggeliki P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000
M/V Monika P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  |  |  |  |  | $ 1,340,000 |  |  |  |  |  |  |  |  |  |  |  |
M/V RT Dagr [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
M/V Aggeliki P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges, Total |  |  |  |  |  |  |  |  |  |  | $ (1,260,000) |  |  |  |  |  |  |
M/V EM Astoria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,750,000 |  |  |  |  |
MV EM Athens [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  |  |  | $ 4,240,000 |  |  |  |  |  |
M/V EM Oinousses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  |  | $ 4,250,000 |  |  |  |  |  |  |  |
M/V EM Corfu [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  |  |  | $ 5,660,000 |  |  |  |  |  |  |  |  |
M/V Akinada Bridge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  |  | $ 11,120,000 |  |  |  |  |  |  |  |  |  |  |
M/V EM Hydra [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  | $ 6,730,000 |  |  |  |  |  |  |  |  |  |  |  |  |
M/V Diamantis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  | $ 5,220,000 |  |  |  |  |  |  |  |  |  |  |  |  |
EM Kea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | $ 9,480,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
EM Spetses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | $ 7,570,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
M/V Synergy Antwerp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  | $ 10,110,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
M/V Synergy Keelung [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  | $ 11,440,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
M/V Synergy Oakland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
M/V Synergy Busan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | $ 10,170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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