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NSC and AdR project development (Details Textual)
$ / shares in Units, gal in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
Apr. 12, 2019
MXN ($)
Oct. 13, 2016
MXN ($)
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
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2015
gal
Dec. 31, 2014
USD ($)
ha
Feb. 26, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Oct. 31, 2015
Schedule of Investments [Line Items]                                    
General and administrative expenses                     $ 4,378,034 $ 4,661,711            
Assets, Total                     181,230,726         $ 172,515,598    
Liabilities, Total                     $ 12,156,440         8,759,695    
Payments For Option Exercised           $ 1,000,000                        
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 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. This Agreement expires on June 30, 2019, unless otherwise extended by mutual agreement of the parties.                              
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.                                  
Subsequent Event [Member]                                    
Schedule of Investments [Line Items]                                    
Loss Contingency, Damages Awarded, Value $ 12,000                                  
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%                
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                     $ 484,000 $ 648,000            
Lease Term               20 years                    
Assets, Total                     29,100,000         26,200,000    
Liabilities, Total                     $ 306,000         $ 243,000    
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% 25.00%                      
Payments For Option Exercised           $ 1,000,000                        
Area of Land               5,000           20.1        
Counter Guaranty Fixed Amount   $ 300,000                                
Equity Method Investment, Ownership Percentage                     50.00%              
Finite-Lived Contractual Rights, Gross                     $ 3,000,000              
Real Estate Held-for-sale                     $ 21,100,000              
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]                                    
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