Schedule of basic and diluted net loss per share (Details) - SEK (kr) kr / shares in Units, kr in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Notes and other explanatory information [abstract]
Loss attributable to ordinary equity holders of the parent (TSEK)	kr (1,118,055)	kr (887,444)	kr (1,721,676)	kr (967,611)
Weighted average number for ordinary shares for basic	62,629,420	40,677,840	43,483,470	40,666,082
Weighted average number for ordinary shares for diluted	62,629,420	40,677,840	43,483,470	40,666,082
Basic net loss per share	kr (17.85)	kr (21.82)	kr (39.59)	kr (23.79)
Diluted net loss per share	kr (17.85)	kr (21.82)	kr (39.59)	kr (23.79)

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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