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NSC and AdR project development (Details Textual) $ / shares in Units, gal in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2019 MXN ($) | Oct. 13, 2016 MXN ($) | Feb. 28, 2018 | Aug. 22, 2016 gal | Nov. 30, 2015 gal | Feb. 28, 2014 USD ($) | May 31, 2013 USD ($) $ / shares | Nov. 30, 2012 USD ($) m² | Feb. 29, 2012 USD ($) | May 31, 2010 gal | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2015 gal | Dec. 31, 2014 USD ($) ha | Feb. 26, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Oct. 31, 2015
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  |  | $ 4,378,034 | $ 4,661,711 |  |  |  |  |  |
Assets, Total |  |  |  |  |  |  |  |  |  |  | 181,230,726 |  |  |  |  | $ 172,515,598 |  |
Liabilities, Total |  |  |  |  |  |  |  |  |  |  | $ 12,156,440 |  |  |  |  | 8,759,695 |  |
Payments For Option Exercised |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  | 43.53% |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |
Subscription Agreement Description |  |  | The Agreement calls for NSC to retain a minimum of 25% of the equity in AdR. One or more affiliates of Greenfield SPV VII, S.A.P.I. de C.V. (“Greenfield”), a Mexico company managed by an affiliate of a leading U.S. asset manager, will acquire a minimum of 55% of the equity of AdR. The Agreement also provides Suez Medio Ambiente México, S.A. de C.V. (“Suez”), a subsidiary of SUEZ International, S.A.S., with the option to purchase 20% of the equity of AdR. If Suez does not exercise this option, NSC will retain 35% of the equity of AdR and Greenfield will acquire 65% of the equity of AdR. The Agreement will become effective when the additional conditions related to the Project are met, including but not limited to those conditions discussed previously. The aggregate investment to be made by the equity partners in the Project, in the form of equity and subordinated shareholder loans, is presently estimated at approximately 20% of the total cost of Phase 1 of the Project. This Agreement expires on June 30, 2019, unless otherwise extended by mutual agreement of the parties. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Security Deposit Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Loss Contingency, Actions Taken by Court, Arbitrator or Mediator | Tenth Civil Judge granted EWG the opportunity to file a counter guarantee in the amount of 1,500,000 Mexican pesos to maintain the ex-parte preliminary relief granted in its favor. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aguas de Rosarito S.A.P.I. de C.V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% | 0.40% |  |  |  |  |  |
Option agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments To Enter Option Agreement |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
NSC Agua [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Total Percentage Of Ownership Interest In An Acquired Company |  |  |  |  |  |  |  |  |  | 99.99% |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  | 100 |  |  |  |  |  | 100 |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  |  | $ 484,000 | $ 648,000 |  |  |  |  |  |
Lease Term |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Assets, Total |  |  |  |  |  |  |  |  |  |  | 29,100,000 |  |  |  |  | 26,200,000 |  |
Liabilities, Total |  |  |  |  |  |  |  |  |  |  | $ 306,000 |  |  |  |  | $ 243,000 |  |
Operating Leases, Rent Expense per month |  |  |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |
Total Voting Interest Percentage After Conversion Of Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.99%
Percentage of Voting Interest Acquired through Option Agreement |  |  |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |
Payments For Option Exercised |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Area of Land |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  | 20.1 |  |  |  |
Counter Guaranty Fixed Amount |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Finite-Lived Contractual Rights, Gross |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |
Real Estate Held-for-sale |  |  |  |  |  |  |  |  |  |  | $ 21,100,000 |  |  |  |  |  |  |
NSC Agua [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  | 99.60% | 99.60% |
NSC Agua [Member] | First Phase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  | 50 | 50 |  |  |  |  |  |  |  | 50 |  |  |  |  |
NSC Agua [Member] | Second Phase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  | 50 | 50 |  |  |  |  |  |  |  | 50 |  |  |  |  |
NSC Agua [Member] | Option agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of inter-company loan payable |  |  |  |  |  |  | $ 5,700,000 |  |  |  |  |  |  |  |  |  |  |
Total Voting Interest Percentage After Conversion Of Loan |  |  |  |  |  |  | 99.99% |  |  |  |  |  |  |  |  |  |  |
Option Agreement Expiration Date |  |  |  |  |  |  |  |  | Feb. 07, 2014 |  |  |  |  |  |  |  |  |
NSA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,600,000 |  |  |  |

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