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NSC and AdR project development (Details)
$ / shares in Units, gal in Millions
 1 Months Ended 12 Months Ended 36 Months Ended
Apr. 12, 2019
Aug. 22, 2016
gal
Feb. 14, 2014
USD ($)
Nov. 30, 2015
gal
Feb. 28, 2014
USD ($)
May 31, 2013
USD ($)
$ / shares
Nov. 30, 2012
USD ($)
m²
Feb. 29, 2012
USD ($)
May 31, 2010
gal
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2015
gal
Dec. 31, 2014
USD ($)
ha
Feb. 26, 2019
MXN ($)
Feb. 28, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]                                
General and administrative expenses                   $ 19,348,958 $ 18,709,419          
Assets, Total                   192,292,144 172,515,598          
Liabilities, Total                   14,339,270 8,759,695          
Payments for land and rights of way held for development                   $ 1,499 2,655,349          
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 MA with the option to purchase 20% of the equity of AdR. If Suez MA 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 conditions precedent 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.            
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]                                
Total Percentage Of Ownership Interest In An Acquired Company                             55.00%  
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           25.00%     50.00% 50.00%         35.00%  
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                   $ 2,348,000 2,884,000          
Lease Term             20 years                  
Assets, Total                   29,300,000 26,200,000          
Liabilities, Total                   2,900,000 $ 243,000          
Operating Leases, Rent Expense per month             $ 30,000                  
Percentage of Voting Interest Acquired through Option Agreement         25.00%                      
Payments For Option Exercised     $ 1,000,000   $ 1,000,000                      
Area of Land             5,000           20.1      
Payments to Acquire Land                         $ 20,600,000      
Real Estate Held-for-sale                   $ 24,200,000            
NSC Agua [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]                                
Schedule of Investments [Line Items]                                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                             25.00%  
Equity Method Investment, Ownership Percentage                     99.60%       0.40% 99.60%
NSC Agua [Member] | First Phase [Member]                                
Schedule of Investments [Line Items]                                
Percentage of the total cost paid                             20.00%  
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal   50   50               50        
Period in which construction must be completed   36 months                            
Period Required To Operate And Maintain Plant And Aqueduct   37 years                            
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]                                
Total Percentage Of Ownership Interest In An Acquired Company                   99.99%            
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                
Greenfield [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]                                
Schedule of Investments [Line Items]                                
Total Percentage Of Ownership Interest In An Acquired Company                             65.00%  
Suez [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]                                
Schedule of Investments [Line Items]                                
Total Percentage Of Ownership Interest In An Acquired Company                             20.00%  
Unaffiliated Party [Member]                                
Schedule of Investments [Line Items]                                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                   50.00%