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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Regulatory Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 25, 2005
Regulatory Assets [Abstract]        
Amortization period of depreciation and salary study expenses 5 years      
Goodwill amortization period 50 years      
Amortization period of deferred acquisition costs 20 years      
Amortization period of deferred franchise costs 80 years      
Summary of regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net $ 2,393,000 $ 2,734,000    
Summary of other deferred assets net of amortization [Abstract]        
Debt issuance cost 2,108,000 2,228,000    
Investment in Co Bank 2,523,000 2,294,000    
Other 565,000 620,000    
Other deferred assets 5,196,000 5,142,000    
Stock Compensation Plans [Abstract]        
Number of share authorize under equity compensation plan (in shares)       500,000
Compensation costs 108,000 120,000 111,000  
Summary of fair value of each option grant is estimated using the Black-Scholes-Merton option pricing model [Abstract]        
Dividend Yield (in hundredths) 4.18% 4.00% 4.20%  
Expected Volatility (in hundredths) 25.13% 24.97% 27.44%  
Risk Free Interest Rate (in hundredths) 1.87% 3.12% 3.38%  
Expected Term 9 years 5 months 19 days 8 years 4 months 10 days 8 years 11 months 19 days  
Base period for calculation of expected dividend yield 12 months      
Period for risk free interest rate base on treasury constant maturity rate 10 years 10 years 10 years  
Accounts Receivable [Abstract]        
Expense related to allowance for doubtful accounts 200,000 300,000    
Summary of changes in entity's accounts receivable [Abstract]        
Gross accounts receivable 5,969,000 5,213,000 5,324,000  
Less allowance for doubtful accounts 241,000 216,000 230,000  
Net accounts receivable 5,728,000 4,997,000 5,094,000  
Summary of allowance for doubtful accounts [Abstract]        
Beginning balance 216,000 230,000 142,000  
Allowance adjustments 215,000 262,000 370,000  
Recoveries 141,000 111,000 78,000  
Write off of uncollectible accounts (331,000) (387,000) (360,000)  
Ending balance 241,000 216,000 230,000  
Cash and Cash Equivalents [Abstract]        
Maximum maturity period of temporary cash investments consider as cash equivalents 3 months      
Customer accounts receivable - water [Member]
        
Summary of changes in entity's accounts receivable [Abstract]        
Gross accounts receivable 3,988,000 3,390,000 3,161,000  
Other [Member]
        
Summary of changes in entity's accounts receivable [Abstract]        
Gross accounts receivable 1,981,000 1,823,000 2,163,000  
2005 Equity Compensation Plan [Member]
        
Stock Compensation Plans [Abstract]        
Number of share authorize under equity compensation plan (in shares) 375,000      
Mountain Hill [Member]
        
Summary of other deferred assets net of amortization [Abstract]        
Other 400,000      
Minimum [Member]
        
Other Deferred Assets [Abstract]        
Amortization period of debt issuance costs 10 years      
Maximum [Member]
        
Other Deferred Assets [Abstract]        
Amortization period of debt issuance costs 30 years      
Maryland [Member]
        
Regulatory Assets [Abstract]        
Amortization period of regulatory rate proceedings and applications 5 years      
Delaware [Member]
        
Regulatory Assets [Abstract]        
Amortization period of regulatory rate proceedings and applications 2 years      
Postretirement benefit obligation [Member]
        
Summary of regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net 497,000 567,000    
Deferred income taxes [Member]
        
Summary of regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net 491,000 506,000    
Goodwill [Member]
        
Summary of regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net 340,000 348,000    
Deferred acquisition and franchise costs [Member]
        
Summary of regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net 824,000 816,000    
Expense of rate and regulatory proceedings [Member]
        
Summary of regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net $ 241,000 $ 497,000