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REGULATORY LIABILITIES - Regulatory Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2017
REGULATORY LIABILITIES [Abstract]
Regulatory liabilities	$ 26,725	$ 30,267	$ 22,800
Utility Plant Retirement Cost Obligation [Member]
REGULATORY LIABILITIES [Abstract]
Regulatory liabilities	207	279
Deferred Settlement Refunds [Member]
REGULATORY LIABILITIES [Abstract]
Regulatory liabilities	0	2,496
Deferred Income Taxes [Member]
REGULATORY LIABILITIES [Abstract]
Regulatory liabilities	$ 26,518	$ 27,492

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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