LEASES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Lease, Description [Abstract]
Option to extend lease term	66 years
Percentage of increase in annual lease payments	3.00%
Rent Expense [Abstract]
Minimum rentals	$ 44,000	$ 40,000
Contingent rentals	0	0
Rent expenses	44,000	40,000
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases	44,000	40,000
Right-of-use assets obtained in exchange for lease obligations [Abstract]
Operating leases	460,000	480,000
Operating leases [Abstract]
Operating lease right-of-use assets	460,000	480,000
Operating lease, liability [Abstract]
Other current liabilities	$ 20,000	$ 19,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities	$ 432,000	$ 450,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityNoncurrent
Total operating lease liabilities	$ 452,000	$ 469,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiability	us-gaap:OperatingLeaseLiability
Weighted Average Remaining Lease Term [Abstract]
Operating leases	59 years	58 years
Weighted Average Discount Rate [Abstract]
Operating leases	5.00%	5.00%
Maturities of Operating Lease Liabilities [Abstract]
2021	$ 42,000
2022	28,000
2023	23,000
2024	23,000
2025	24,000
Thereafter	1,306,000
Total undiscounted lease payments	1,446,000
Less effects of discounting	(994,000)
Total lease liabilities recognized	$ 452,000	$ 469,000
Artesian Water [Member] | Land Improvements [Member]
Operating Lease, Description [Abstract]
Operating lease period	33 years
Portion of lease term determining annual lease payment	11 years
Rental payments	$ 16,500	16,300	$ 16,500
Artesian Water [Member] | Office Equipment [Member]
Operating Lease, Description [Abstract]
Operating lease period	3 years
Rental payments	$ 19,000	$ 19,000
Minimum [Member]
Operating Lease, Description [Abstract]
Remaining lease term	1 year
Maximum [Member]
Operating Lease, Description [Abstract]
Remaining lease term	76 years