XML 67 R48.htm IDEA: XBRL DOCUMENT
v3.25.4

Summary of Significant Accounting Policies - Advances for Construction and Contributions in Aid of Construction, Estimated Refunds (Details) $ in Thousands | Dec. 31, 2025 USD ($)
--- | ---
Estimated Refunds of Advances for Construction [Abstract] |
2026 | $ 2,569
2027 | 2,535
2028 | 2,615
2029 | 2,592
2030 | 2,549
Thereafter | $ 45,627

X
- Definition Advances for Construction, Estimated Refunds, After Year Five + References No definition available. + Details
Name: | hto_AdvancesForConstructionEstimatedRefundsAfterYearFive
Namespace Prefix: | hto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Advances for Construction, Estimated Refunds, Next Twelve Months + References No definition available. + Details
Name: | hto_AdvancesForConstructionEstimatedRefundsNextTwelveMonths
Namespace Prefix: | hto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Advances for Construction, Estimated Refunds, Year Five + References No definition available. + Details
Name: | hto_AdvancesForConstructionEstimatedRefundsYearFive
Namespace Prefix: | hto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Advances for Construction, Estimated Refunds, Year Four + References No definition available. + Details
Name: | hto_AdvancesForConstructionEstimatedRefundsYearFour
Namespace Prefix: | hto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Advances for Construction, Estimated Refunds, Year Three + References No definition available. + Details
Name: | hto_AdvancesForConstructionEstimatedRefundsYearThree
Namespace Prefix: | hto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Advances for Construction, Estimated Refunds, Year Two + References No definition available. + Details
Name: | hto_AdvancesForConstructionEstimatedRefundsYearTwo
Namespace Prefix: | hto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated Refunds of Advances for Construction [Abstract] + References No definition available. + Details
Name: | hto_EstimatedRefundsOfAdvancesForConstructionAbstract
Namespace Prefix: | hto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration