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NSC and AdR Project Development (Details Textual)
gal in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 13, 2016
MXN ($)
Feb. 28, 2018
Aug. 22, 2016
gal
Nov. 30, 2015
gal
Feb. 28, 2014
USD ($)
May 31, 2013
USD ($)
Nov. 30, 2012
USD ($)
m²
Feb. 29, 2012
USD ($)
May 31, 2010
gal
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2015
gal
Dec. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Investments [Line Items]                                
General and administrative expenses                   $ 4,554,754 $ 5,001,669 $ 9,322,198 $ 9,798,861      
Assets                   167,300,824   167,300,824       $ 165,480,895
Liabilities                   $ 9,033,892   9,033,892       9,459,518
Payments to Acquire Land                       $ 25,152 0      
Equity Method Investment, Ownership Percentage                   43.53%   43.53%        
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.
                            
Aguas de Rosarito S.A.P.I. de C.V [Member]                                
Schedule of Investments [Line Items]                                
Equity Method Investment, Ownership Percentage   0.40%                            
Option agreement [Member]                                
Schedule of Investments [Line Items]                                
Payments To Enter Option Agreement               $ 300,000                
N S C 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                   $ 664,000 $ 885,000 $ 1,312,000 $ 1,605,000      
Payments to Acquire Land Held-for-use                       20,600,000        
Lease Term             20 years                  
Assets                   24,400,000   24,400,000       22,300,000
Liabilities                   208,000   208,000       $ 173,000
Operating Leases, Rent Expense, Net             $ 15,000                  
Percentage of Voting Interest Acquired through Option Agreement         25.00%                      
Payments For Option Exercised         $ 1,000,000                      
Area of Land | m²             5,000                  
Payments to Acquire Land                             $ 20,600,000  
Counter Guaranty Fixed Amount $ 300,000                              
Finite-Lived Contractual Rights, Gross                   $ 1,300,000   $ 1,300,000        
N S C Agua [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]                                
Schedule of Investments [Line Items]                                
Equity Method Investment, Ownership Percentage                               99.60%
N S C Agua [Member] | First Phase [Member]                                
Schedule of Investments [Line Items]                                
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal     50 50                   50    
N S C Agua [Member] | Second Phase [Member]                                
Schedule of Investments [Line Items]                                
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal     50 50                   50    
N S C 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%                    
Payments For Option Exercised         $ 1,000,000                      
Option Agreement Expiration Date         Feb. 07, 2014