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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The number of municipalities within the service territory of the Company provided service as distinct performance obligations.

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Period of time between invoice being sent to customer and when payment is due, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
Revenue (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Municipality	Sep. 30, 2017 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 12,575	$ 12,569	$ 35,986	$ 35,884
Rents from regulated property	123	123	382	352
Total operating revenue	12,698	12,692	$ 36,368	36,236
Utility Service [Member]
Revenue [Abstract]
Number of days for customer to make payment after being invoiced			20 days
Water Utility Service [Member] \| Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	7,969	7,886	$ 22,740	22,690
Water Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,598	3,616	10,093	10,128
Water Utility Service [Member] \| Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	744	739	2,178	2,207
Wastewater Utility Service [Member] \| Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	186	235	696	608
Wastewater Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	46	57	171	135
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	16	16	$ 48	48
Number of municipalities within the service territory provided service \| Municipality			4
Number of days for customer to make payment after being invoiced			30 days
Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	13	14	$ 45	49
Number of days for customer to make payment after being invoiced			30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 3	$ 6	$ 15	$ 19