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REGULATORY PROCEEDINGS (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2016
Nov. 24, 2015
May 31, 2015
Nov. 13, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Aug. 18, 2015
Apr. 11, 2014
Delaware [Member]                    
Rate Proceedings [Abstract]                    
Percentage of gross water sales             15.00%      
Period to complete rate case by law             7 months      
Delaware [Member] | Maximum [Member]                    
Rate Proceedings [Abstract]                    
Temporary annual rate increase subject to 15% gross water sales limitation             $ 2,500,000      
Percentage of rate relief allowed should a rate case not complete             15.00%      
Other Proceedings [Abstract]                    
Distribution System Improvement Charge rate increase applied between base rate filings             7.50%      
Distribution System Improvement Charge rate increase within a 12-month period             5.00%      
Artesian Water [Member]                    
Rate Proceedings [Abstract]                    
Percentage of revenue increase in a filed request to implement new rates                   15.90%
Amount of annual revenue increase in a filed request to implement new rates                   $ 10,000,000
Authorized rate increase in annualized basis revenue                 $ 6,000,000  
Incremental increase to customers                 6.20%  
Percentage increase in annual operating revenue due to temp rate increase in effect                 9.50%  
Other Proceedings [Abstract]                    
Percentage of Distribution System Improvement Charges annual rate increase application filed by company to regulatory 2.30% 1.57% 1.15% 0.34%            
Increase in revenue due to DSIC rate increase application, annually $ 10,300,000 $ 7,000,000 $ 4,600,000 $ 1,300,000            
Revenue earned in DSIC rate increases         $ 432,000 $ 218,000 $ 938,000 $ 340,000