REGULATORY ASSETS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Regulatory Assets [Abstract]
Contributions to postretirement benefit plan	$ 6,000
Amortization period of other regulatory expense [Abstract]
Rate case studies	5 years
Goodwill	50 years
Deferred acquisition costs	20 years
Franchise costs	80 years
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 7,142,000	$ 7,254,000
Maximum [Member]
Amortization period of other regulatory expense [Abstract]
Debt related cost	25 years
Minimum [Member]
Amortization period of other regulatory expense [Abstract]
Debt related cost	15 years
Postretirement Benefit Obligation [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 75,000	74,000
Deferred Income Taxes [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	397,000	401,000
Expense of Rate Case Studies [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	36,000	22,000
Debt Issuance Costs [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	5,727,000	5,815,000
Goodwill [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	294,000	295,000
Deferred Acquisition and Franchise Costs [Member]
Regulatory assets net of amortization, comprise [Abstract]
Regulatory assets, net	$ 613,000	$ 647,000