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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

X

- 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

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- 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

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- Definition

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+ 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

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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