Schedule of consolidated statements of financial position (Details) - Polar charge AB [Member] - SEK (kr) kr in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
IfrsStatementLineItems [Line Items]
Comprehensive income loss	kr 1,430	kr 282
Interest in joint venture	kr 13,027	kr 11,597

The amount of change in equity resulting from transactions and other events, other than those changes resulting from transactions with owners in their capacity as owners.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details