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REGULATORY ASSETS (Details) - USD ($)
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Regulatory Assets [Line Items]    
Regulatory assets, net $ 2,609,000 $ 2,561,000
Period over which depreciation and salary study expenses amortized (in years) 5 years  
Period over which Delaware rate proceedings and applications expenses amortized (in years) 2 years  
Period over which Maryland rate proceedings and applications expenses amortized five years or until the next rate increase application  
Period over which goodwill amortized (in years) 50 years  
Period over which Port Deposit and Cecil County deferred acquisition costs amortized (in years) 20 years  
Period over which Cecil County deferred franchise costs amortized (in years) 80 years  
Artesian Water contributed to its postretirement benefit plan $ 86,000  
Postretirement benefit obligation [Member]    
Regulatory Assets [Line Items]    
Regulatory assets, net 384,000 384,000
Deferred income taxes recoverable in future rates [Member]    
Regulatory Assets [Line Items]    
Regulatory assets, net 450,000 461,000
Goodwill A R T N A [Member]    
Regulatory Assets [Line Items]    
Regulatory assets, net 320,000 325,000
Deferred acquisition and franchise costs [Member]    
Regulatory Assets [Line Items]    
Regulatory assets, net 729,000 756,000
Expense of rate and regulatory proceedings [Member]    
Regulatory Assets [Line Items]    
Regulatory assets, net $ 726,000 $ 635,000