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REGULATORY PROCEEDINGS (Details) (USD $)
 9 Months Ended 9 Months Ended
Sep. 27, 2011
Sep. 30, 2012
Delaware [Member]
Sep. 30, 2012
Artesian Water [Member]
Sep. 30, 2011
Artesian Water [Member]
Jun. 30, 2012
Artesian Water [Member]
May 31, 2012
Artesian Water [Member]
Jan. 31, 2012
Artesian Water [Member]
Dec. 31, 2010
Artesian Water [Member]
Sep. 30, 2012
Artesian Water Maryland [Member]
Rate Proceedings [Abstract]                  
Maximum temporary annual rate increase subject to 15% gross water sales limitation   $ 2,500,000              
Percentage of gross water sales maximum temporary annual rate increase subject to $2.5 million limitation (in hundredths)   15.00%              
Period to complete rate case by law (in months)   7 months              
Percentage of rate relief allowed should a rate case not complete, maximum (in hundredths)   15.00%              
Percentage of revenue increase in a filed request to implement new rates (in hundredths)             11.13%    
Amount of annual revenue increase in a filed request to implement new rates             6,250,000    
Return on Equity (in hundredths)     10.00%            
Reclassification of accumulated depreciation to deferred credits     1,200,000            
Service Territory Expansion Proceedings [Abstract]                  
Number of agreements terminated by Artesian Wastewater Maryland and Cecil County 2                
Increase in Number of Customers                 1,500
Other Proceedings [Abstract]                  
Distribution System Improvement Charge rate increase applied between base rate filings, maximum (in hundredths)   7.50%              
Distribution System Improvement Charge rate increase maximum within a 12-month period (in hundredths)   5.00%              
Percentage of annual rate charge increase application filed with regulatory agency (in hundredths)           0.14%      
Increase in annual revenue expected from rate increase application approval         486,000        
Percentage of Distribution System Improvement Charges annual rate increase application filed by company to regulatory (in hundredths)               1.47%  
Revenue earned in DSIC rate increases     $ 23,000 $ 347,000