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Commitments and contingencies (Details Textual) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) gal | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jun. 29, 2011 gal
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Operating Leases, Rent Expense, Net |  |  |  |  | $ 834,738 | $ 821,845 | $ 812,658 |  |
Royalty Payment Percentage |  |  |  |  | 7.50% |  |  |  |
Employment Agreement Base Annual Salaries |  |  |  |  | $ 2,100,000 |  |  |  |
Cayman Water Retail Operations, Percentage Of Gross Profit |  |  |  |  | 56.00% | 56.00% | 54.00% |  |
Cayman Water Retail Operations, Percentage Of Revenue |  |  |  |  | 40.00% | 40.00% | 36.00% |  |
Noncancellable Lease Term Expiration Date |  |  |  |  | 2035 |  |  |  |
Long-term Purchase Commitment, Amount |  |  |  |  | $ 2,900,000 |  |  |  |
Operating Income (Loss) |  |  |  |  | $ 1,823,302 | $ 8,468,064 | $ 6,461,059 |  |
Long-term Purchase Commitment, Date |  |  |  |  | Dec. 31, 2019 |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  |  |  | $ 50,299 | (485,291) | (111,409) |  |
Cash and Cash Equivalents, at Carrying Value, Total |  |  |  |  | 39,254,116 | 44,792,734 | 35,713,689 | $ 33,626,516 |
Accounts Receivable, Net, Current, Total |  |  |  |  | 16,500,798 | 9,529,016 |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | 2,000,000 | 0 | 0 |  |
Indonesia, Rupiahs |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Total |  |  |  |  | 28,000 |  |  |  |
Accounts Receivable, Net, Current, Total |  |  |  |  | $ 7,000 |  |  |  |
Cw Bahamas [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Delivery Terms Volume Of Water Per Week | gal |  |  |  |  | 63,000,000 |  |  |  |
Cw Belize [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Delivery Terms, Volume of water per day | gal |  |  |  |  |  |  |  |  | 450,000
CW Bali [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Plant Capacity | gal |  |  |  |  | 790,000 |  |  |  |
Operating Income (Loss) |  |  |  |  | $ (2,744,361) | (483,544) | (458,393) |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ (542,000) | $ 28,000 | $ (309,000) | $ 202,000 |  |  |  |  |
Translation Adjustment Functional to Reporting Currency, Net of Tax |  | (549,555) |  | (549,555) | 549,555 |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 2,000,000 |  |  | 2,000,000 | 0 | $ 0 |  |
Net Assets |  |  |  |  | 1,200,000 |  |  |  |
CW Bali [Member] | Indonesia, Rupiahs |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Translation Adjustment Functional to Reporting Currency, Net of Tax |  | $ (549,555) |  | $ (549,555) | $ (549,555) | $ (533,365) |  |  |

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