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Note 12 - Derivatives and Fair Value Disclosures (Details Textual) ¥ in Billions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 JPY (¥) | Dec. 31, 2014 JPY (¥) | Jun. 02, 2017 USD ($) | Oct. 13, 2015 USD ($) | Sep. 22, 2015 USD ($) | Jul. 06, 2015 USD ($) | Apr. 10, 2014 USD ($)
Interest Rate Swap, Floating Rate, Based on LIBOR |  |  |  | 1.14% |  |  |  |  |  |  |  |  |
Foreign Currenc,y Forward Contracts, Converted Amount | ¥ |  |  |  |  |  |  | ¥ 0.5 | ¥ 0.4 |  |  |  |  |
Impaired Long-lived Assets, Pre-impairment Carrying Value |  |  |  |  | $ 32,235,086 |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  | $ 2,156,002 | 5,735,086 |  |  |  |  |  |  |  |
Depreciation, Total |  |  |  | 38,921,672 | 39,096,589 | $ 35,857,507 |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | 4,305,271 |  |  |  |  |  |  |  |  |
Gas Icon and Gas Emperor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure |  | $ 5,800,000 |  |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Costs to Sell |  | 220,000 |  |  |  |  |  |  |  |  |  |  |
Gas Monarch [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived Assets Held-for-use, Fair Value Disclosure |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Depreciation, Total |  | $ 255,015 |  |  |  |  |  |  |  |  |  |  |
Long-lived Assets Held-for-use, Fair Value Disclosure, Net | $ 5,744,985 |  |  | 5,744,985 |  |  |  |  |  |  |  |  |
Gas Moxie and Gas Nirvana [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure |  |  | $ 6,250,000 |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Costs to Sell |  |  | 272,750 |  |  |  |  |  |  |  |  |  |
Gas Pasha and Gas Evoluzione [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived Assets Held-for-use, Fair Value Disclosure |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |
Depreciation, Total | 200,130 |  |  |  |  |  |  |  |  |  |  |  |
Long-lived Assets Held-for-use, Fair Value Disclosure, Net | 7,799,870 |  |  | 7,799,870 |  |  |  |  |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 68,935,006 |  |  | $ 68,935,006 | $ 60,750,343 |  |  |  | $ 15,996,125 | $ 11,171,875 | $ 12,120,000 | $ 17,553,663 | $ 17,553,663
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  | 2.12% |  | 1.54% | 1.69% | 2.60%
Derivative, Number of Instruments Held, Total |  |  |  |  |  |  |  |  |  | 2 |  |  |
Interest Rate Swap [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 1.52% |  |  | 1.52% |  |  |  |  |  |  |  |  |
Interest Rate Swap [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 2.60% |  |  | 2.60% |  |  |  |  |  |  |  |  |
Interest Rate Swap 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  |  | 1.52% |  |  |
Interest Rate Swap 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  |  | 1.55% |  |  |

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