Revenue (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) Municipality	Mar. 31, 2018 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 11,706	$ 11,515
Rents from regulated property	125	129
Total operating revenue	$ 11,831	11,644
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	$ 7,458	7,318
Water Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,163	3,134
Water Utility Service [Member] \| Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	734	713
Wastewater Utility Service [Member] \| Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	253	247
Wastewater Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	60	61
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 18	16
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	$ 17	18
Number of days for customer to make payment after being invoiced	30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 3	$ 8

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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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