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Note 6 - Vessels, Net (Details Textual) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 12, 2017 | Aug. 11, 2017 | May 30, 2017 | Apr. 20, 2017
Gain (Loss) on Disposition of Property Plant Equipment, Total | $ (77,314) | $ 118,427 | $ 33,251 |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 2,156,002 | 5,735,086 |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | 4,305,271 |  |  |  |  |  |
Forty Vessels [Member] |  |  |  |  |  |  |
Debt Instrument, Collateral Amount | 762,159,589 |  |  |  |  |  |
Impairment Loss [Member] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 2,156,002 | 5,735,086 |  |  |  |  |
Gas Arctic and Gas Ice Vessels [Member] | Net Gain on Sale of Vessels [Member] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  | $ 118,427 |  |  |  |  |
Gas Icon [Member] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  | $ 2,900,000
Impairment of Long-Lived Assets to be Disposed of | 1,747,923 |  |  |  |  |  |
Gas Emperor [Member] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  | $ 2,900,000 |
Impairment of Long-Lived Assets to be Disposed of | 580,004 |  |  |  |  |  |
Gas Moxie [Member] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ 2,575,000 |  |
Impairment of Long-Lived Assets to be Disposed of | 570,626 |  |  |  |  |  |
Gas Nirvana [Member] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 1,406,718 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | $ 3,675,000 |  |  |
Gas Icon, Gas Emperor, Gax Moxie, Gas Nirvana [Member] | Net Gain on Sale of Vessels [Member] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total | $ 77,314 |  |  |  |  |  |

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