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Commitments and contingencies (Details Textual)
 12 Months Ended
Dec. 31, 2017
USD ($)
gal
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 29, 2011
gal
Commitments And Contingencies [Line Items]        
Operating Leases, Rent Expense, Net | $ $ 844,561 $ 834,738 $ 821,845  
Royalty Payment Percentage 7.50%      
Employment Agreement Base Annual Salaries | $ $ 1,900,000      
Cayman Water Retail Operations, Percentage Of Gross Profit 50.00% 56.00% 56.00%  
Cayman Water Retail Operations, Percentage Of Revenue 37.00% 40.00% 40.00%  
Noncancellable Lease Term Expiration Date 2021      
Long-term Purchase Commitment, Amount | $ $ 4,400,000      
North Sound Water Works Plant [Member]        
Commitments And Contingencies [Line Items]        
Production Capacity of Water,Volume 1,600,000      
Expiry Date of Supply Agreement 2018-07      
Red Gate Water Works Plant [Member]        
Commitments And Contingencies [Line Items]        
Production Capacity of Water,Volume 1,300,000      
Expiry Date of Supply Agreement 2018-07      
North Side Water Works Plant [Member]        
Commitments And Contingencies [Line Items]        
Production Capacity of Water,Volume 2,400,000      
Expiry Date of Supply Agreement 2019-06      
Cw Bahamas [Member]        
Commitments And Contingencies [Line Items]        
Delivery Terms Volume Of Water Per Week 63,000,000      
Cw Belize [Member]        
Commitments And Contingencies [Line Items]        
Delivery Terms, Volume of water per day       450,000