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REGULATORY PROCEEDINGS (Details) - USD ($)
 12 Months Ended
Nov. 24, 2015
Aug. 18, 2015
May. 31, 2015
Nov. 30, 2014
Nov. 13, 2014
Dec. 17, 2013
Jan. 18, 2013
Dec. 31, 2015
Dec. 31, 2014
Jun. 10, 2014
Apr. 11, 2014
Rate Proceedings [Abstract]                      
Return on Equity             10.00%        
Reclassification of accumulated depreciation to deferred credits               $ 1,200,000      
Delaware [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               15.00%      
Period to complete rate case by law               7 months      
Percentage of rate relief allowed should a rate case not complete, maximum               15.00%      
Other Proceedings [Abstract]                      
Distribution System Improvement Charge rate increase applied between base rate filings, maximum               7.50%      
Distribution System Improvement Charge rate increase maximum within a 12-month period               5.00%      
Artesian Water [Member]                      
Rate Proceedings [Abstract]                      
Percentage of revenue increase requested for new rates                     15.90%
Incremental Increase to Customers                     12.58%
Increase in annual revenue expected from rate increase application approval                     $ 10,000,000
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  
Permanent rate increase in revenue   $ 6,000,000                  
Percentage of Permanent Rate Increases on an annualized basis (in hundredths)   9.50%                  
An incremental increase to customers above the DSIC rate previously in effect   6.20%                  
Other Proceedings [Abstract]                      
Increase in annual revenue expected from rate increase application approval                     $ 10,000,000
Percentage of Distribution System Improvement Charges annual rate increase application filed by company to regulatory 1.57%   1.15% 0.34% 7.17% 3.32%   3.32%      
Increase Amount Based On Eligible Plant Improvements Since Last Rate Increase $ 7,000,000   $ 4,600,000 $ 1,300,000 $ 4,500,000 $ 12,900,000          
Revenue earned in DSIC rate increases               $ 520,000.0 $ 789,000.0    
Artesian Wastewater [Member]                      
Rate Proceedings [Abstract]                      
Percentage of revenue increase requested for new rates             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        
Other Proceedings [Abstract]                      
Increase in annual revenue expected from rate increase application approval             $ 174,000