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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		6 Months Ended
Revenue (Details) $ in Thousands	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Municipality	Jun. 30, 2017 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 11,896	$ 12,141	$ 23,411	$ 23,315
Rents from regulated property	130	113	259	229
Operating revenue	12,026	12,254	$ 23,670	23,544
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	7,453	7,671	$ 14,771	14,804
Water Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,361	3,393	6,495	6,512
Water Utility Service [Member] \| Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	721	749	1,434	1,468
Wastewater Utility Service [Member] \| Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	263	232	510	373
Wastewater Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	64	57	125	78
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	16	14	$ 32	32
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	14	20	$ 32	35
Number of days for customer to make payment after being invoiced			30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 4	$ 5	$ 12	$ 13