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Note 21 - Subsequent Events (Details Textual) - USD ($) |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 17, 2018 | Mar. 29, 2018 | Jan. 15, 2018 | Jan. 10, 2018 | Jan. 05, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2018 | Feb. 01, 2018 | Jun. 02, 2017 | Oct. 13, 2015 | Sep. 22, 2015 | Jul. 06, 2015 | Apr. 10, 2014
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  |  |  | $ 60,612,867 | $ 56,215,758 | $ 155,072,744 |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  |  |  | 11,479,936 | 1,530,177 | $ 2,010,302 |  |  |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 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%
Subsequent Event [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | $ 21,586,250 | $ 32,632,000 |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  | 2.74% | 2.74% |  |  |  |  |
Subsequent Event [Member] | One Liquified Petroleum Gas Carrier Under Construction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Construction in Process |  |  |  |  | $ 5,208,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Eco Arctic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  |  | $ 31,968,500 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Eco Ice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total |  |  | $ 32,704,200 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Gas Legacy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  | $ 4,990,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Eco Freeze [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | $ 33,427,120 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The cash outflow from construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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