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General information and significant accounting policies (Details Textual)
 1 Months Ended 3 Months Ended
Aug. 06, 2013
shares
Jun. 30, 2016
shares
Nov. 30, 2015
shares
Mar. 31, 2014
shares
Mar. 31, 2017
Subsidiary
shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Number Of Vessels In Operation         27
Average Age Of Vessels         4 years 7 months 6 days
Stock Issued During Period, Shares, New Issues   7,500,000 4,000,000 8,050,000  
Equity Method Investment, Ownership Percentage 100.00%        
Number Of Wholly Owned Subsidiaries | Subsidiary         46
Direct And Indirect Ownership In All Subsidiary         100.00%
Investor [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Sale of Stock, Percentage of Ownership after Transaction 55.40%       82.80%
GA Holdings LLC [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Equity Method Investment, Ownership Percentage 44.60%       17.20%
Number Of Shares Exchanged For Reorganization 8,049,500        
GA Holdings LLC [Member] | Common Stock [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Stock Issued During Period, Shares, New Issues         5,787,942
IPO [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Stock Issued During Period, Shares, New Issues 10,000,000