NSC and AdR project development (Details) $ / shares in Units, gal in Millions				1 Months Ended							3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 29, 2020	Apr. 12, 2019	Aug. 22, 2016	Feb. 28, 2018	Aug. 22, 2016 gal	Nov. 30, 2015 gal	Feb. 28, 2014 USD ($)	May 31, 2013 USD ($) $ / shares	Feb. 29, 2012 USD ($)	May 31, 2010 gal	Jun. 30, 2020 USD ($) ha	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ha	Jun. 30, 2019 USD ($)	Dec. 31, 2015 gal	Dec. 31, 2019 USD ($)	Feb. 26, 2019 MXN ($)	Dec. 31, 2018
Schedule of Investments [Line Items]
Period Required To Operate And Maintain Plant And Aqueduct			37 years
General and administrative expenses											$ 4,861,028	$ 4,994,992	$ 10,014,785	$ 9,373,026
Assets, Total											180,824,923		180,824,923			$ 192,292,144
Liabilities, Total											11,282,095		11,282,095			14,339,270
Payments For Option Exercised							$ 1,000,000.0
Land											21,100,000		21,100,000
Number of days to submit list of non-recoverable expenses made	20 days
Impairment loss on long-lived assets											(3,000,000.0)
Adjustment to reduce operating lease right of use assets											2,600,000		2,600,000
Adjustment to reduce operating lease liabilities											$ 2,200,000		$ 2,200,000
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, would acquire a minimum of 55% of the equity of AdR. The Agreement also provided Suez MA with the option to purchase 20% of the equity of AdR. If Suez MA did not exercise this option, NSC would retain 35% of the equity of AdR and Greenfield will acquire 65% of the equity of AdR. The Agreement became effective when the certain conditions precedent related to the Project were met. 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.
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.
Aguas de Rosarito S.A.P.I. de C.V [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage											50.00%		50.00%
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%
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal					100					100
Period in which construction must be completed			36 months
General and administrative expenses											$ 304,000	$ 779,000	$ 762,000	$ 1,263,000
Assets, Total											23,400,000		23,400,000			29,300,000
Liabilities, Total											$ 135,000		$ 135,000			$ 2,900,000
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							$ 1,000,000.0
Area of Land | ha											20.1		20.1
Payments for land and rights of way held for development													$ 3,000,000.0
Equity Method Investment, Ownership Percentage											50.00%		50.00%
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%
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