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REGULATORY ASSETS (Details) - USD ($)
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Regulatory Assets [Line Items]    
Artesian Water contributed to its postretirement benefit plan $ 26,000  
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 $ 7,696,000 $ 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
Deferred Income Taxes [Member]    
Summary of regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 419,000 431,000
Debt Related Costs [Member]    
Summary of regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 6,048,000 1,648,000
Expense of Rate and Regulatory Proceedings [Member]    
Summary of regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 82,000 116,000
Goodwill [Member]    
Summary of regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net 305,000 310,000
Deferred Acquisition and Franchise Costs [Member]    
Summary of regulatory assets net of amortization, comprise [Abstract]    
Regulatory assets, net $ 656,000 $ 683,000