OPUC (Details 2) - OPUC - Pending Rate Case [Member] - Gas Distribution [Member] - Cascade Natural Gas [Member]	Mar. 31, 2020 USD ($)
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 4,900,000
Public Utilities, Requested Rate Increase (Decrease), Percentage	7.20%
Environmental Remediation Deferred Costs Increase (Decrease) Amount	$ 364,000

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.

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