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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 1 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Subsidiary	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Utility Subsidiary Accounting [Abstract]
Number of wholly owned subsidiaries | Subsidiary	5
Utility Plant [Abstract]
Capitalized rate of AFUDC	7.40%	7.70%	8.10%
Summary of utility plant comprises [Abstract]
Utility plant, gross	$ 624,792	$ 577,447
Less - accumulated depreciation	126,114	116,945
Utility plant, net	$ 498,678	$ 460,502
Depreciation and Amortization [Abstract]
Depreciation rates of water utility plant	2.28%	2.27%	2.25%
Minimum [Member]
Depreciation and Amortization [Abstract]
Amortization period of other deferred assets	20 years
Maximum [Member]
Depreciation and Amortization [Abstract]
Amortization period of other deferred assets	24 years
Property Held for Future Use [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	0 years
Utility plant, gross	$ 24,395	$ 14,647
Construction in Progress [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	0 years
Utility plant, gross	$ 19,694	12,700
Utility plant in service-Water [Member] | Mains [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	81 years
Utility plant, gross	$ 267,352	252,569
Utility plant in service-Water [Member] | Services [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	39 years
Utility plant, gross	$ 45,661	42,232
Utility plant in service-Water [Member] | Storage Tanks [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	76 years
Utility plant, gross	$ 25,167	24,729
Utility plant in service-Water [Member] | Meters [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	26 years
Utility plant, gross	$ 26,531	25,628
Utility plant in service-Water [Member] | Hydrants [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	60 years
Utility plant, gross	$ 14,514	13,760
Utility plant in service-Water [Member] | Intangible plant [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	0 years
Utility plant, gross	$ 140	140
Utility plant in service-Water [Member] | Source of supply plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, gross	$ 22,320	20,959
Utility plant in service-Water [Member] | Source of supply plant [Member] | Minimum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	45 years
Utility plant in service-Water [Member] | Source of supply plant [Member] | Maximum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	85 years
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, gross	$ 85,399	81,180
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] | Minimum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	8 years
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] | Maximum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	62 years
Utility plant in service-Water [Member] | General plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, gross	$ 60,536	56,784
Utility plant in service-Water [Member] | General plant [Member] | Minimum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	3 years
Utility plant in service-Water [Member] | General plant [Member] | Maximum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	31 years
Utility plant in service-Wastewater [Member] | General plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, gross	$ 1,206	1,006
Utility plant in service-Wastewater [Member] | General plant [Member] | Minimum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	3 years
Utility plant in service-Wastewater [Member] | General plant [Member] | Maximum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	31 years
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member]
Summary of utility plant comprises [Abstract]
Utility plant, gross	$ 17,635	17,421
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] | Minimum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	35 years
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] | Maximum [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	62 years
Utility plant in service-Wastewater [Member] | Collection Mains & Lift Stations [Member]
Summary of utility plant comprises [Abstract]
Estimated useful life	81 years
Utility plant, gross	$ 14,242	$ 13,692

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Wholly owned subsidiaries of Artesian Resources Corporation.

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