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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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	$ 325	$ 259	$ 599	$ 483
Total Operating Revenue	20,238	20,502	39,144	39,691
Regulated Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	18,533	18,921	35,815	36,554
Regulated Revenue [Member] | Consumption Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	11,919	11,790	22,638	22,195
Regulated Revenue [Member] | Fixed Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	6,447	6,102	12,853	12,302
Regulated Revenue [Member] | Service Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	167	242	324	514
Regulated Revenue [Member] | DSIC [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	800	787	1,548	1,543
Regulated Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	(800)	0	(1,548)	0
Non-Regulated Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	1,380	1,322	2,730	2,654
Non-Regulated Revenue [Member] | Service Line Protection Plans [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	996	950	1,978	1,904
Non-Regulated Revenue [Member] | Contract Operations [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	337	327	696	655
Non-Regulated Revenue [Member] | Inspection Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenue	$ 47	$ 45	$ 56	$ 95

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
-Topic 606
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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