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NSC and AdR project development (Details)
$ / shares in Units, gal in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
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 ($)
May 31, 2010
gal
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2015
gal
Dec. 31, 2012
USD ($)
m²
Dec. 31, 2014
USD ($)
ha
Dec. 31, 2019
USD ($)
Feb. 26, 2019
MXN ($)
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]                                      
Period Required To Operate And Maintain Plant And Aqueduct   37 years                                  
General and administrative expenses                   $ 5,153,757 $ 4,378,034                
Assets, Total                   185,692,159         $ 192,292,144        
Liabilities, Total                   14,117,652         14,339,270        
Payments For Option Exercised           $ 1,000,000                          
Land Available for Development                   $ 24,162,523         24,162,523        
Share Price | $ / shares             $ 1.0                        
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. This Agreement was originally scheduled to expire on June 30, 2019 but has been extended to September 30, 2020.                                
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%               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%                    
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal       100         100                    
General and administrative expenses                   $ 458,000 $ 484,000                
Lease Term                         20 years            
Assets, Total                   29,000,000         29,300,000        
Liabilities, Total                   $ 2,300,000         $ 2,900,000        
Operating Leases, Rent Expense Every Two months                         $ 26,000            
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          
Equity Method Investment, Ownership Percentage                   50.00%                  
Land Available for Development                   $ 24,200,000                  
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]                                      
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                      
NSA [Member]                                      
Schedule of Investments [Line Items]                                      
Payments to Acquire Land                           $ 20,600,000