REGULATORY PROCEEDINGS (Details) - USD ($)						3 Months Ended
	Nov. 30, 2015	Aug. 18, 2015	May. 31, 2015	Nov. 30, 2014	Nov. 13, 2014	Mar. 31, 2016	Mar. 31, 2015	Jun. 10, 2014	Apr. 11, 2014
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%
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
Percentage of Permanent Rate Increases on an annualized basis (in hundredths)		6.20%
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)	1.57%		1.15%	0.34%
Increase in revenue due to DSIC rate increase application, annually	$ 7,000,000		$ 4,600,000	$ 1,300,000
Revenue earned in DSIC rate increases						$ 249,000	$ 63,000
Permanent Rate Increase in Revenue		$ 6,000,000
Percentage of Permanent Rate Increases on an annualized basis (in hundredths)		9.50%