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NSC and AdR project development (Details)
$ / shares in Units, gal in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended
Apr. 12, 2019
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, 2019
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2015
gal
Dec. 31, 2014
USD ($)
ha
Oct. 31, 2019
a
Feb. 26, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Oct. 31, 2015
Schedule of Investments [Line Items]                                                
General and administrative expenses                   $ 4,825,627   $ 4,807,079       $ 14,198,653 $ 13,915,759              
Assets, Total                   182,777,845           182,777,845           $ 172,515,598    
Liabilities, Total                   $ 9,836,965           $ 9,836,965           8,759,695    
Payments For Option Exercised         $ 1,000,000                                      
Payments for land and rights of way held for development                                 $ 2,168,180              
Equity Method Investment, Ownership Percentage                   43.53%           43.53%                
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 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. This Agreement was scheduled to expire on June 30, 2019 but has been extended to December 31,2019.                                            
Security Deposit Liability                                         $ 1,000,000      
Loss Contingency, Damages Awarded, Value $ 12,000                                              
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.                                              
Subsequent Event [Member]                                                
Schedule of Investments [Line Items]                                                
Area of Land | a                                       1.3        
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%       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                     $ 546,000   $ 846,000 $ 1,809,000 $ 2,158,000                  
Lease Term             20 years                                  
Assets, Total                     29,700,000     29,700,000               26,200,000    
Liabilities, Total                     2,900,000     2,900,000               $ 243,000    
Operating Leases, Rent Expense per month             $ 30,000                                  
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                     $ 1,000,000                
Area of Land             5,000                       20.1          
Equity Method Investment, Ownership Percentage                   50.00%           50.00%                
Real Estate Held-for-sale                     $ 24,200,000     $ 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%           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