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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jan. 31, 2019
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   $ 7,254,000 $ 7,549,000  
Summary of other deferred assets net of amortization [Abstract]        
Investment in Co Bank   3,610,000 3,358,000  
Other   321,000 363,000  
Other deferred assets   3,931,000 3,721,000  
Regulatory Liabilities [Line Items]        
Decrease in the net deferred income tax liability   24,300,000 23,500,000  
Net regulatory liability amount   22,800,000 22,500,000  
Regulatory Liabilities   $ 22,813,000 23,201,000  
Minimum [Member]        
Amortization period of other regulatory expense [Abstract]        
Amortization period of debt related cost 15 years      
Maximum [Member]        
Amortization period of other regulatory expense [Abstract]        
Amortization period of debt related cost 25 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    
DEPSC [Member]        
Regulatory Liabilities [Line Items]        
Regulatory liabilities, amortization period   49 years 6 months    
DEPSC [Member] | Subsequent Event [Member]        
Regulatory Liabilities [Line Items]        
Net regulatory liability amount       $ 22,200,000
MDPSC [Member]        
Regulatory Liabilities [Line Items]        
Net regulatory liability amount   $ 600,000    
Artesian Water [Member]        
Regulatory Assets [Abstract]        
Contributions to postretirement benefit plan   38,000    
Postretirement Benefit Obligation [Member]        
Regulatory Liabilities [Line Items]        
Regulatory Liabilities   52,000 112,000  
Utility Plant Retirement Cost Obligation [Member]        
Regulatory Liabilities [Line Items]        
Regulatory Liabilities   319,000 549,000  
Deferred Income Taxes [Member]        
Regulatory Liabilities [Line Items]        
Regulatory Liabilities   22,442,000 22,540,000  
Postretirement Benefit Obligation [Member]        
Regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net   74,000 149,000  
Deferred Income Taxes [Member]        
Regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net   401,000 416,000  
Expense of Rate and Regulatory Proceedings [Member]        
Regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net   22,000 70,000  
Debt Issuance Costs [Member]        
Regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net   5,815,000 5,965,000  
Goodwill [Member]        
Regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net   295,000 303,000  
Deferred Acquisition and Franchise Costs [Member]        
Regulatory assets net of amortization, comprise [Abstract]        
Regulatory assets, net   647,000 $ 646,000  
Mountain Hill [Member]        
Summary of other deferred assets net of amortization [Abstract]        
Other   $ 200,000