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General information and significant accounting policies (Details Textual)
 1 Months Ended 6 Months Ended
Aug. 06, 2013
shares
Nov. 30, 2015
shares
Mar. 31, 2014
shares
Jun. 30, 2016
shares
Jul. 27, 2016
VesselSubsidiary
Average Age Of Vessels       4 years 6 months  
Stock Issued During Period, Shares, New Issues   4,000,000 8,050,000 7,500,000  
Direct And Indirect Ownership In All Subsidiary       100.00%  
Subsequent Event [Member]          
Number Of Vessels In Operation | VesselSubsidiary         22
IPO [Member]          
Stock Issued During Period, Shares, New Issues 10,000,000        
GA Holdings LLC [Member]          
Stock Issued During Period, Shares, New Issues       5,702,288  
Equity Method Investment, Ownership Percentage 44.60%     17.03%  
Number Of Shares Exchanged For Reorganization 8,049,500        
Public Investor [Member]          
Sale of Stock, Percentage of Ownership after Transaction 55.40%     82.97%