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Subsequent events (Details Textual) - Subsequent Event [Member]
$ in Millions
1 Months Ended
Feb. 11, 2016
USD ($)
Consolidated Water U.S. Holdings Inc [Member]  
Subsequent Event [Line Items]  
Noncontrolling Interest, Ownership Percentage by Parent 51.00%
Business Combination, Consideration Transferred, Total $ 7.7
Aerex Industries Inc [Member]  
Subsequent Event [Line Items]  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 49.00%