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Subsequent Event (Notes)	6 Months Ended
	Jun. 30, 2018
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event CLWSC completed its acquisition of the Deer Creek Ranch Water Co., LLC’s water system on July 2, 2018 for a purchase price of $2,700. In 2017, CLWSC entered into an agreement to purchase the water system assets. Deer Creek Ranch includes approximately 750 service connections over an area of 1,191 acres in the Texas Hill Country on the rapidly growing western fringe of the Austin metropolitan area, about 40 miles south of CLWSC’s operating area of New Braunfels.

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Subsequent Event [Abstract]

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No definition available.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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