Consolidated Balance Sheets (Parenthetical) (Unaudited) - $ / shares |
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
|---|---|---|---|
| Par value (in dollars per share) | $ 0 | $ 0 | $ 0 |
| Shares authorized (in shares) | 100,000,000 | 100,000,000 | 100,000,000 |
| Shares issued (in shares) | 42,093,292 | 41,563,577 | 40,909,610 |
| Shares outstanding (in shares) | 42,093,292 | 41,563,577 | 40,909,610 |
| NW Natural | |||
| Other receivable, after allowance for credit loss, related party [Extensible Enumeration] | Affiliated Entity [Member] | Affiliated Entity [Member] | Affiliated Entity [Member] |
| Accounts payable, related party [Extensible Enumeration] | Affiliated Entity [Member] | Affiliated Entity [Member] | Affiliated Entity [Member] |
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- Definition Indicates status and type of related party for accounts payable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Face amount per share of no-par value common stock. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Indicates status and type of related party for receivable, after allowance for credit loss, classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Details
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