REGULATORY ASSETS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Regulatory Assets [Line Items]
Artesian Water contributed to its postretirement benefit plan	$ 9,000
Amortization period of other regulatory expense [Abstract]
Depreciation and salary studies	5 years
Goodwill	50 years
Deferred acquisition costs	20 years
Franchise costs	80 years
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 7,922,000	$ 3,374,000
Maximum [Member]
Amortization period of other regulatory expense [Abstract]
Amortization period of debt related cost	25 years
Minimum [Member]
Amortization period of other regulatory expense [Abstract]
Amortization period of debt related cost	15 years
Maryland [Member]
Amortization period of other regulatory expense [Abstract]
Regulatory rate proceedings	5 years
Delaware [Member]
Amortization period of other regulatory expense [Abstract]
Regulatory rate proceedings	2 years 6 months
Postretirement Benefit Obligation [Member]
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 186,000	186,000
Debt Related Costs [Member]
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	6,221,000	1,648,000
Deferred Income Taxes [Member]
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	427,000	431,000
Goodwill [Member]
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	309,000	310,000
Deferred Acquisition and Franchise Costs [Member]
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	674,000	683,000
Expense of Rate and Regulatory Proceedings [Member]
Summary of regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 105,000	$ 116,000