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General information and significant accounting policies (Details Textual)		1 Months Ended		3 Months Ended
	Aug. 06, 2013 shares	Nov. 30, 2015 shares	Mar. 31, 2014 shares	Mar. 31, 2016 VesselSubsidiary shares
Number Of Vessels In Operation | VesselSubsidiary				24
Average Age Of Vessels				4 years 6 months
Stock Issued During Period, Shares, New Issues		4,000,000	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				4,348,798
Equity Method Investment, Ownership Percentage	44.60%			16.80%
Number Of Shares Exchanged For Reorganization	8,049,500
Public Investor [Member]
Equity Method Investment, Ownership Percentage	55.40%			83.20%

X

- Definition

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

+ References

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- Definition

The percentage of ownership held in the subsidiary.

+ References

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- Definition

Number of shares exchanged for reorganization.

+ References

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- Definition

The number of vessels in operations.

+ References

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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)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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