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REGULATORY ASSETS (Details) - USD ($)
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Regulatory Assets [Abstract]    
Contributions to postretirement benefit plan $ 18,600  
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  
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net $ 7,424,000 $ 7,549,000
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  
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]    
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net $ 149,000 149,000
Deferred Income Taxes [Member]    
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 408,000 416,000
Debt Related Costs [Member]    
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 56,000 70,000
Expense of Rate and Regulatory Proceedings [Member]    
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 5,878,000 5,965,000
Goodwill [Member]    
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 299,000 303,000
Deferred Acquisition and Franchise Costs [Member]    
Regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net $ 634,000 $ 646,000