Acquisitions Net Assets Acquired (Details) - USD ($)			3 Months Ended	12 Months Ended
	Oct. 16, 2018	May 30, 2018	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash and cash equivalents			$ 7,513,000	$ 7,513,000	$ 12,756,000
Accounts receivable — net			1,631,000	1,631,000	1,488,000
Property, Plant and Equipment, Net			233,554,000	233,554,000	227,055,000
Property, plant and equipment			326,303,000	326,303,000	312,148,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment			(92,749,000)	(92,749,000)	(85,093,000)
Accounts payable			992,000	992,000	604,000
Customer and Meter Deposits			1,445,000	1,445,000	1,460,000
Advances in aid of construction			67,621,000	67,621,000	67,684,000
Contributions in Aid of Construction			14,520,000	14,520,000	10,670,000
Accrued Liabilities, Current			7,546,000	7,546,000	7,465,000
Goodwill			4,398,000	4,398,000	2,639,000
Business Combination, Contingent Consideration, Liability			838,000	838,000	0
Contract with Customer, Liability			17,959,000	17,959,000	$ 17,698,000
Red Rock Utilities [Member]
Business Acquisition [Line Items]
Accounts receivable — net			111,000	111,000
Property, Plant and Equipment, Net			19,841,000	19,841,000
Property, plant and equipment			748,000	748,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment			(6,084,000)	(6,084,000)
Prepaid Expense			12,000	12,000
Intangible Assets, Gross (Excluding Goodwill)			196,000	196,000
Accounts payable			26,000	26,000
Taxes Payable			14,000	14,000
Accrued Liabilities			47,000	47,000
Customer and Meter Deposits			(76,000)	(76,000)
Contributions in Aid of Construction			7,397,000	7,397,000
Assets			3,003,000	3,003,000
Goodwill			2,848,000	2,848,000
Payments to Acquire Businesses, Gross	$ 5,900,000			5,851,000
Business Combination, Contingent Consideration, Liability			838,000	838,000
Contract with Customer, Liability			3,423,000	3,423,000
Turner Ranches Water and Sanitation Company [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			176,000	176,000
Accounts receivable — net			121,000	121,000
Property, Plant and Equipment, Net			4,495,000	4,495,000
Property, plant and equipment			92,000	92,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment			(3,554,000)	(3,554,000)
Accounts payable			30,000	30,000
Accrued Liabilities, Current			49,000	49,000
Assets			1,251,000	1,251,000
Goodwill			1,549,000	$ 1,549,000
Payments to Acquire Businesses, Gross		$ 2,800,000	$ 2,800,000