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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
REVENUE RECOGNITION [Abstract]
Refund to customers through reduced tariff rates			$ (3,800)
Minimum number of days for accounts receivable from tariff 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	$ 291	$ 301
Total Operating Revenues	19,901	19,386
Tariff Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	18,204	17,684
Tariff Revenue [Member] | Consumption Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	10,160	10,393
Tariff Revenue [Member] | Fixed Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	6,737	6,648
Tariff Revenue [Member] | Service Charges [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	147	177
Tariff Revenue [Member] | DSIC [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,152	888
Tariff Revenue [Member] | Industrial Wastewater Services [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	8	0
Tariff Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	0	(422)
Non-Tariff Revenue [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,406	1,401
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	1,088	1,050
Non-Tariff Revenue [Member] | Contract Operations [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	216	328
Non-Tariff Revenue [Member] | Inspection Fees [Member]
Disaggregation of Revenue [Abstract]
Total Operating Revenues	$ 102	$ 23

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.

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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

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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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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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