NSC and AdR Project Development (Details Textual) gal in Millions		1 Months Ended								12 Months Ended			36 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 ($)	Nov. 30, 2012 USD ($) m²	Feb. 29, 2012 USD ($)	May 31, 2010 gal	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) gal	Dec. 31, 2014 USD ($) ha	Mar. 31, 2018	Oct. 31, 2015
Schedule of Investments [Line Items]
General and administrative expenses										$ 19,072,979	$ 18,677,584	$ 14,840,156
Assets, Total										165,480,895	163,604,528
Liabilities, Total										$ 9,459,518	9,499,156
Equity Method Investment, Ownership Percentage										43.53%
Aguas de Rosarito S.A.P.I. de C.V [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage														0.40%
Option agreement [Member]
Schedule of Investments [Line Items]
Payments To Enter Option Agreement								$ 300,000
N S C 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										$ 3,000,000	3,000,000	$ 2,000,000
Lease Term							20 years
Assets, Total										23,100,000
Liabilities, Total										173,000	$ 221,000
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%
Payments For Option Exercised					$ 1,000,000
Area of Land							5,000						20.1
Counter Guaranty Fixed Amount	$ 300,000
Finite-Lived Contractual Rights, Gross										947,000
Real Estate Held-for-sale										$ 20,600,000
N S C Agua [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage										99.60%
N S C Agua [Member] | First Phase [Member]
Schedule of Investments [Line Items]
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal			50	50								50
N S C Agua [Member] | Second Phase [Member]
Schedule of Investments [Line Items]
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal			50	50								50
N S C 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%
Percentage of Voting Interest Acquired through Option Agreement								25.00%
Payments For Option Exercised					$ 1,000,000
Option Agreement Expiration Date								Feb. 07, 2014
NSA [Member]
Schedule of Investments [Line Items]
Payments to Acquire Land													$ 20,600,000
Subsequent Event [Member]
Schedule of Investments [Line Items]
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 U.S. asset manager, will acquire a minimum of 55% 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.