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NSC and AdR Project Development (Details Textual) $ / shares in Units, gal in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
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 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2015 gal | Dec. 31, 2014 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  | $ 4,941,564 | $ 4,896,323 | $ 14,263,762 | $ 14,695,184 |  |  |
Assets |  |  |  |  |  |  |  |  |  | 172,502,559 |  | 172,502,559 |  |  |  | $ 165,480,895
Liabilities |  |  |  |  |  |  |  |  |  | $ 10,459,804 |  | 10,459,804 |  |  |  | 9,459,518
Payments to Acquire Land |  |  |  |  |  |  |  |  |  |  |  | $ 2,168,180 | 665,270 |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 43.53% |  | 43.53% |  |  |  |
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. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 846,000 | $ 864,000 | $ 2,158,000 | $ 2,469,000 |  |  |
Payments to Acquire Land Held-for-use |  |  |  |  |  |  |  |  |  |  |  | 20,600,000 |  |  |  |
Lease Term |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  | 26,200,000 |  | 26,200,000 |  |  |  | 23,100,000
Liabilities |  |  |  |  |  |  |  |  |  | 276,000 |  | 276,000 |  |  |  | $ 173,000
Operating Leases, Rent Expense, Net |  |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |
Percentage of Voting Interest Acquired through Option Agreement |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Payments For Option Exercised |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Area of Land | m² |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,600,000 |
Counter Guaranty Fixed Amount | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Contractual Rights, Gross |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  | $ 3,000,000 |  |  |  |
Aguas de Rosarito S.A.P.I. de C.V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aguas de Rosarito S.A.P.I. de C.V [Member] | NSC Agua [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 99.60% |  | 99.60% |  |  |  | 99.60%
First Phase [Member] | NSC Agua [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  | 50 | 50 |  |  |  |  |  |  |  |  |  | 50 |  |
Second Phase [Member] | NSC Agua [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  | 50 | 50 |  |  |  |  |  |  |  |  |  | 50 |  |
Option agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments To Enter Option Agreement |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
Option agreement [Member] | NSC Agua [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% |  |  |  |  |  |  |  |  |  |
Payments For Option Exercised |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Option Agreement Expiration Date |  |  |  |  | Feb. 07, 2014 |  |  |  |  |  |  |  |  |  |  |

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