Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Interest Rate Swap [Abstract]
Term of debt on utilities rated A- used to discount prospective cash flows	30 years
Reduction in fair value of swap liability	$ 196
Fair Value Estimate Not Practicable, Financial Liabilities [Abstract]
Customer advances for construction	8,532	$ 7,500
Fair Value Estimate Not Practicable, Financial Assets [Abstract]
Notes receivable	255	255
Fair Value on a Recurring Basis [Member]
Interest Rate Swap [Abstract]
Interest rate swap	3,118	2,511
Fair Value on a Recurring Basis [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Interest Rate Swap [Abstract]
Interest rate swap	3,118	2,511
Carrying Amount [Member]
Fair Value, Financial Liabilities [Abstract]
Total long-term debt	87,509	87,542
Estimate of Fair Value [Member]
Fair Value, Financial Liabilities [Abstract]
Total long-term debt	105,000	102,000
Carrying Amount (Fair Value Estimate Not Practicable) [Member]
Fair Value Estimate Not Practicable, Financial Liabilities [Abstract]
Customer advances for construction	8,532	7,500
Fair Value Estimate Not Practicable, Financial Assets [Abstract]
Notes receivable	$ 255	$ 255

For utilities only, represents the carrying amount of the liability as of the balance sheet date for payments received by a utility from its customers in advance of performing its obligations under terms of its construction agreements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 405
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68049106&loc=d3e50628-109371

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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The increase or decrease in the value of an interest rate swap due to a contractual agreement tied to the company's credit rating.

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Term of debt on utilities rated A- used in discounting prospective cash flows anticipated to be made under the swap agreement reflecting a representation of the yield to maturity.

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