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REGULATORY PROCEEDINGS (Details) - USD ($)
 3 Months Ended 6 Months Ended
May. 31, 2015
Nov. 30, 2014
Nov. 13, 2014
Dec. 17, 2013
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 10, 2014
Apr. 11, 2014
Jan. 18, 2013
Rate Proceedings [Abstract]                        
Percentage of gross water sales maximum temporary annual rate increase subject to $2.5 million limitation (in hundredths)               15.00%        
Percentage of rate relief allowed should a rate case not complete, maximum (in hundredths)               15.00%        
Recover specific investments made in infrastructure through DSIC         3.32%     3.32%        
Other Proceedings [Abstract]                        
Percentage of Distribution System Improvement Charges annual rate increase application filed by company to regulatory (in hundredths)     7.17%                  
Increase in revenue due to DSIC rate increase application, annually     $ 4,500,000                  
Delaware [Member]                        
Rate Proceedings [Abstract]                        
Maximum temporary annual rate increase subject to 15% gross water sales limitation               $ 2,500,000        
Period to complete rate case by law (in months)               7 months        
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%        
Artesian Water [Member]                        
Rate Proceedings [Abstract]                        
Percentage of revenue increase in a filed request to implement new rates (in hundredths)                     15.90%  
Amount of annual revenue increase in a filed request to implement new rates                     $ 10,000,000  
Incremental Increase to Customers                     12.58%  
Percentage increase in annual operating revenue due to temp rate increase in effect                   3.98%    
Annualized operating revenue increase due to temp rate increase in effect                   $ 2,500,000    
Other Proceedings [Abstract]                        
Percentage of Distribution System Improvement Charges annual rate increase application filed by company to regulatory (in hundredths) 0.81% 0.34%   3.32%                
Increase in revenue due to DSIC rate increase application, annually $ 3,300,000 $ 1,300,000   $ 12,900,000                
Revenue earned in DSIC rate increases         $ 59,000   $ 294,000 $ 122,000 $ 789,000      
Artesian Wastewater [Member]                        
Rate Proceedings [Abstract]                        
Percentage of revenue increase in a filed request to implement new rates (in hundredths)                       34.80%
Amount of annual revenue increase in a filed request to implement new rates                       $ 343,000
Increase in annual revenue expected from rate increase application approval                       $ 174,000
Return on Equity (in hundredths)           10.00%