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Capitalization (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2015
Dec. 31, 2014
May. 31, 2014
Aug. 31, 2013
May. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2015
Jul. 31, 2015
May. 31, 2015
Schedule of Capitalization [Line Items]                      
Shares authorized   40,000,000       40,000,000 40,000,000        
Authorized shares under plan           300,000          
Issuance of shares under the DRP           $ 1,462,000 $ 1,493,000 $ 1,653,000      
Additional Shares Authorized By SEC To Be Issued                   700,000  
Maximum number of shares authorized for grant           100,000          
Preferred Stock, Shares Authorized   126,000       126,000 126,000        
Preferred Stock, Shares Outstanding   24,000       24,000 24,000        
Proceeds from long-term debt borrowing           $ 7,000,000 $ 12,246,000 4,045,000      
Long-term debt   $ 140,029,000       $ 140,279,000 $ 140,029,000        
Weighted average interest rate   3.99%       3.87% 3.99%        
Deobligated principal payments           $ 466,000 $ 64,000      
Other long term debt   $ 50,800,000       54,700,000 $ 50,800,000        
Customer advances   21,978,000       $ 20,461,000 $ 21,978,000        
Dividend Reinvestment and Common Stock Purchase Plan [Member]                      
Schedule of Capitalization [Line Items]                      
Shares authorized           3,000,000          
Dividend Reinvestment & Common Stock Purchase Plan, cumulative shares           2,300,000          
Outside Director Stock Compensation Plan [Member]                      
Schedule of Capitalization [Line Items]                      
Authorized shares under plan           72,120          
Common stock granted and issued under plan           4,795 5,082 5,432      
Maximum number of shares authorized for grant           100,000          
Preferred stock dividends in arrears           $ 0          
Convertible Preferred Stock $7.00 Series [Member]                      
Schedule of Capitalization [Line Items]                      
Shares issued upon conversion           12          
Convertible preferred stock converted, shares           4,293          
Convertible preferred stock converted, value           $ 500,000          
Stock issued upon conversion of convertible preferred stock (shares)           51,516          
Percentage of stock that may be redeemed in a given calander year           10.00%          
Convertible Preferred Stock $8.00 Series [Member]                      
Schedule of Capitalization [Line Items]                      
Shares issued upon conversion           13.714          
Convertible preferred stock converted, shares       4,000              
Convertible preferred stock converted, value       $ 500,000              
Stock issued upon conversion of convertible preferred stock (shares)       54,856              
Tidewater [Member]                      
Schedule of Capitalization [Line Items]                      
Loan amount $ 4,000,000               $ 15,000,000    
Proceeds from long-term debt borrowing 7,000,000 8,000,000                  
Long-term debt $ 11,000,000                    
Interest reate 4.45%                    
Maturity date           Apr. 01, 2040          
New Jersey Environmental Infrastructure Trust [Member]                      
Schedule of Capitalization [Line Items]                      
Proceeds from long-term debt borrowing     $ 3,800,000                
Long-term debt           $ 30,200,000          
Deobligated principal payments           500,000   $ 100,000      
First Mortgage Bonds - Series TT [Member] | New Jersey Environmental Infrastructure Trust [Member]                      
Schedule of Capitalization [Line Items]                      
Interest reate         0.00%            
Maturity date         Aug. 01, 2032            
First Mortgage Bonds - Series UU [Member] | New Jersey Environmental Infrastructure Trust [Member]                      
Schedule of Capitalization [Line Items]                      
Maturity date         Aug. 01, 2032            
First Mortgage Bonds - Series VV [Member] | New Jersey Environmental Infrastructure Trust [Member]                      
Schedule of Capitalization [Line Items]                      
Issuance of series bonds     $ 2,800,000                
Interest reate                     0.00%
Maturity date     Aug. 01, 2033                
First Mortgage Bonds - Series WW [Member] | New Jersey Environmental Infrastructure Trust [Member]                      
Schedule of Capitalization [Line Items]                      
Issuance of series bonds     $ 900,000                
Interest rate, minimum     3.00%                
Interest rate, maximum     5.00%                
Maturity date     Aug. 01, 2033                
Delaware State Revolving Fund [Member]                      
Schedule of Capitalization [Line Items]                      
Long-term debt           $ 9,300,000          
Delaware State Revolving Fund [Member] | Tidewater [Member]                      
Schedule of Capitalization [Line Items]                      
Proceeds from long-term debt borrowing             $ 600,000        
Long-term debt   $ 1,100,000         $ 1,100,000        
Interest reate   3.45%         3.45%        
Maturity date           Aug. 01, 2031          
New Jersey Economic Development Authority [Member]                      
Schedule of Capitalization [Line Items]                      
Long-term debt           $ 55,400,000