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General information and significant accounting policies (Details Textual)		1 Months Ended	9 Months Ended
	Aug. 06, 2013 shares	Mar. 31, 2015 shares	Sep. 30, 2015 VesselSubsidiary shares
Number Of Vessels In Operation | VesselSubsidiary			22
Number Of Vessels Under Construction | VesselSubsidiary			2
Average Age Of Vessels			4 years 3 months 18 days
Stock Issued During Period, Shares, New Issues		8,050,000
Equity Method Investment, Ownership Percentage	100.00%
Direct And Indirect Ownership In All Subsidiary			100.00%
IPO [Member]
Stock Issued During Period, Shares, New Issues	10,000,000
GA Holdings LLC [Member]
Stock Issued During Period, Shares, New Issues			8,178,517
Equity Method Investment, Ownership Percentage	44.60%		31.00%
Number Of Shares Exchanged For Reorganization	8,049,500
Public Investor [Member]
Equity Method Investment, Ownership Percentage	55.40%		69.00%

X

- Definition

Average age of vessels, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The percentage of ownership held in the subsidiary.

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- Definition

Number of shares exchanged for reorganization.

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- Definition

The number of vessels in operations.

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- Definition

The number of vessels under construction.

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (a)(1)



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- Definition

Number of new stock issued during the period.

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-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



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-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 29, 30



-Article 5

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