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Capitalization (Details Narrative) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Schedule of Capitalization [Line Items]    
Dividend Reinvestment and Common Stock Purchase Plan, shares 64,034  
Dividend Reinvestment and Common Stock Purchase Plan $ 1,200  
Outside director compensation plan, shares 5,768  
Outside director compensation plan 100  
Outstanding borrowings under loan 137,474 136,736
Customer advances for construction 22,042 21,944
Bonds to be refinanced, maximum 60,000  
Bonds to be refinanced, total 57,500  
Carrying amount
    
Schedule of Capitalization [Line Items]    
Other long-term debt for which not practicable to estimate their fair value 48,500 49,300
Customer advances for construction 22,000 21,900
New Jersey Enviornmental Trust Fund
    
Schedule of Capitalization [Line Items]    
Issuance of first mortgage bonds 3,900  
Series OO
    
Schedule of Capitalization [Line Items]    
Issuance of first mortgage bonds 3,000  
Final Maturity Date Aug. 01, 2031  
Series PP
    
Schedule of Capitalization [Line Items]    
Issuance of first mortgage bonds 900  
Interest, minimum 2.00%  
Interest, maximum 5.00%  
Final Maturity Date Aug. 01, 2031  
Subsidiaries [Member] | Loan - Delaware SRF Program
    
Schedule of Capitalization [Line Items]    
Loan closed under State Revolving Fund program 2,800  
Final Maturity Date Jul. 01, 2031  
Rate of interest (as a percent) 3.75%  
Outstanding borrowings under loan 2,700  
Southern Shore | Loan - Delaware SRF Program
    
Schedule of Capitalization [Line Items]    
Loan closed under State Revolving Fund program 1,600  
Final Maturity Date Nov. 30, 2030  
Rate of interest (as a percent) 3.75%  
Outstanding borrowings under loan $ 1,400