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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 28, 2017
May 03, 2017
May 04, 2016
Dec. 18, 2015
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 09, 2015
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             $ 7,549,000 $ 3,374,000    
Summary of other deferred assets net of amortization [Abstract]                    
Investment in Co Bank             3,358,000 3,198,000    
Other             363,000 386,000    
Other deferred assets             3,721,000 3,584,000    
Regulatory Liabilities [Abstract]                    
Decrease in the net deferred income tax liability             23,500,000      
Net regulatory liability amount             22,500,000      
Regulatory Liabilities [Line Items]                    
Regulatory liabilities, net             $ 23,201,000 $ 1,022,000    
Income Tax Disclosure [Line Items]                    
Percentage of limitation on deductable interest expense             30.00%      
Federal corporate tax rate             34.00% 34.00% 34.00%  
Stock Compensation Plans [Abstract]                    
Granted (in shares)             0 0 0  
Number of share authorize under equity compensation plan (in shares)                   331,500
Compensation costs             $ 423,000 $ 92,000 $ 183,000  
Unrecognized expense related to non-vested awards of restricted shares granted             64,000      
Summary of fair value of each option grant is estimated using the Black-Scholes-Merton option pricing model [Abstract]                    
Granted, restricted stock awards (in shares)     5,000              
Fair market value (in dollars per share)     $ 27.70              
Award vesting period     1 year              
Accounts Receivable [Abstract]                    
Expense related to allowance for doubtful accounts             200,000 200,000    
Summary of changes in entity's accounts receivable [Abstract]                    
Gross accounts receivable             9,185,000 8,059,000 6,627,000  
Less allowance for doubtful accounts             288,000 263,000 277,000  
Net accounts receivable             8,897,000 7,796,000 6,350,000  
Summary of allowance for doubtful accounts [Abstract]                    
Beginning balance         $ 263,000 $ 288,000 263,000 277,000 250,000  
Allowance adjustments             215,000 195,000 205,000  
Recoveries             41,000 64,000 53,000  
Write off of uncollectible accounts             (231,000) (273,000) (231,000)  
Ending balance             $ 288,000 263,000 277,000  
Cash and Cash Equivalents [Abstract]                    
Maximum maturity period of temporary cash investments considered as cash equivalents             3 months      
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      
Unrestricted Stock [Member] | 2015 Equity Compensation Plan [Member]                    
Summary of fair value of each option grant is estimated using the Black-Scholes-Merton option pricing model [Abstract]                    
Shares issued as fully vested unrestricted stock awards (in shares)       5,000            
Fair market value (in dollars per share)       $ 27.38            
Artesian Water [Member]                    
Regulatory Assets [Abstract]                    
Contributions to postretirement benefit plan             $ 37,000      
Class A Stock [Member] | Unrestricted Stock [Member] | 2015 Equity Compensation Plan [Member]                    
Stock Compensation Plans [Abstract]                    
Compensation costs $ 250,000                  
Summary of fair value of each option grant is estimated using the Black-Scholes-Merton option pricing model [Abstract]                    
Granted, restricted stock awards (in shares) 6,568                  
Fair market value (in dollars per share) $ 38.06                  
Class A Stock [Member] | Restricted Stock [Member] | 2015 Equity Compensation Plan [Member]                    
Stock Compensation Plans [Abstract]                    
Compensation costs   $ 127,000         $ 47,000 92,000    
Summary of fair value of each option grant is estimated using the Black-Scholes-Merton option pricing model [Abstract]                    
Granted, restricted stock awards (in shares)   5,000                
Fair market value (in dollars per share)   $ 38.10                
Award vesting period             1 year      
Mountain Hill [Member]                    
Summary of other deferred assets net of amortization [Abstract]                    
Other             $ 300,000      
Plan [Member]                    
Income Tax Disclosure [Line Items]                    
Federal corporate tax rate           21.00%        
Postretirement Benefit Obligation [Member]                    
Regulatory Liabilities [Line Items]                    
Regulatory liabilities, net             112,000 149,000    
Utility Plant Retirement Cost Obligation [Member]                    
Regulatory Liabilities [Line Items]                    
Regulatory liabilities, net             549,000 873,000    
Deferred Income Taxes [Member]                    
Regulatory Liabilities [Line Items]                    
Regulatory liabilities, net             22,540,000 0    
Postretirement Benefit Obligation [Member]                    
Summary of regulatory assets net of amortization, comprise [Abstract]                    
Regulatory assets, net             149,000 186,000    
Deferred Income Taxes [Member]                    
Summary of regulatory assets net of amortization, comprise [Abstract]                    
Regulatory assets, net             416,000 431,000    
Expense of Rate and Regulatory Proceedings [Member]                    
Summary of regulatory assets net of amortization, comprise [Abstract]                    
Regulatory assets, net             70,000 116,000    
Debt Issuance Costs [Member]                    
Summary of regulatory assets net of amortization, comprise [Abstract]                    
Regulatory assets, net             5,965,000 1,648,000    
Goodwill [Member]                    
Summary of regulatory assets net of amortization, comprise [Abstract]                    
Regulatory assets, net             303,000 310,000    
Deferred Acquisition and Franchise Costs [Member]                    
Summary of regulatory assets net of amortization, comprise [Abstract]                    
Regulatory assets, net             646,000 683,000    
Customer accounts receivable - water [Member]                    
Summary of changes in entity's accounts receivable [Abstract]                    
Gross accounts receivable             5,487,000 5,437,000 5,017,000  
Contractual amounts due from developers and other [Member]                    
Summary of changes in entity's accounts receivable [Abstract]                    
Gross accounts receivable             $ 3,698,000 $ 2,622,000 $ 1,610,000  
Federal [Member] | Minimum [Member]                    
Income Tax Contingency [Line Items]                    
Open tax year             2015      
Years under federal audit               2012    
Federal [Member] | Maximum [Member]                    
Income Tax Contingency [Line Items]                    
Open tax year             2017      
Years under federal audit               2014    
State [Member] | Minimum [Member]                    
Income Tax Contingency [Line Items]                    
Open tax year             2014      
State [Member] | Maximum [Member]                    
Income Tax Contingency [Line Items]                    
Open tax year             2017