v3.26.1

Regulatory Matters (Details) $ in Millions						3 Months Ended
Regulatory Matters (Details) $ in Millions	Apr. 28, 2026 USD ($) case	Nov. 01, 2025	May 01, 2025	Apr. 29, 2025 USD ($) period	Jun. 27, 2024 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Jan. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Revenue credits						$ 0.2	$ 0.2
Water Plant
Public Utilities, General Disclosures [Line Items]
Construction cost included in rate base								$ 7.8
ACC
Public Utilities, General Disclosures [Line Items]
Requested revenue increase				$ 1.1
Return on equity, percentage				9.60%
Requested rate, number of phase-in periods \| period				3
Requested equity capital structure (as a percent)		25.00%	50.00%
Requested deferral of recovery of acquisition premium					$ 3.0
Subsequent Event \| ACC
Public Utilities, General Disclosures [Line Items]
Number of regulatory rate cases \| case	2
Amount disallowed	$ 0.1
Subsequent Event \| ACC \| GW-Santa Cruz Rate Case
Public Utilities, General Disclosures [Line Items]
Requested revenue increase	2.3
Plant held for future use	$ 3.4

Public Utilities, Number of Regulatory Rate Cases

+ References

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- Definition

Public Utilities, Property, Plant And Equipment, Plant Held For Future Use

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Public Utilities, Requested Deferral Of Recovery Of Acquisition Premium, Amount

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Public Utilities, Requested Rate, Phase-In Period

+ References

No definition available.

+ Details

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Namespace Prefix:	gwrs_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Revenue Credits

+ References

No definition available.

+ Details

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Balance Type:	debit
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- 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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Balance Type:	na
Period Type:	duration

- Definition

Discloses the amount of construction work in process that is included in the rate making process at period end.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of disallowed costs for rate making purposes for recently completed plants in regulated industries.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 10.E)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section 35
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478654/980-360-35-12

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- Definition

Percentage of public utility's requested equity to capital, including debt and equity.

+ References

No definition available.

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- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

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Balance Type:	credit
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- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

+ Details

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- Details

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- Details

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Global Water Resources, Inc. 10-Q