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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUE RECOGNITION [Abstract]
Minimum number of days due for accounts receivable from regulated contract customers			25 days
Minimum number of days due for accounts receivable from SLP Plan customer			25 days
Minimum number of days customers services invoiced in advance			30 days
Disaggregation of Revenue [Abstract]
Other Operating Revenue not in scope of ASC 606	$ 338	$ 243	$ 937	$ 726
Total Operating Revenue	21,924	22,356	61,068	62,047
Regulated Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	20,160	20,735	55,975	57,289
Regulated Revenue [Member] | Consumption Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	13,648	13,109	36,286	35,304
Regulated Revenue [Member] | Fixed Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	6,330	6,521	19,182	18,823
Regulated Revenue [Member] | Service Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	182	247	507	761
Regulated Revenue [Member] | DSIC [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	655	858	2,203	2,401
Regulated Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	(655)	0	(2,203)	0
Non-Regulated Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	1,426	1,378	4,156	4,032
Non-Regulated Revenue [Member] | Service Line Protection Plans [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	982	978	2,960	2,882
Non-Regulated Revenue [Member] | Contract Operations [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	329	340	1,025	995
Non-Regulated Revenue [Member] | Inspection Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	$ 115	$ 60	$ 171	$ 155

X

- Definition

Minimum number of days services invoiced in advance beginning of every month for customer, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The minimum number of days due for accounts receivable after invoicing from regulated contract customers, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The minimum number of days due for accounts receivable after invoicing from Service Line Protection Plans (SLP) customers, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The total amount of revenue recognized for the period from rental income and other revenue.

+ References

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- References

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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