Provisions - Reconciliation of defined benefit obligation (Details) - 12 months ended Dec. 31, 2025 |
USD ($) |
CHF (SFr) |
CHF (SFr) |
|---|---|---|---|
| Other Provisions, Contingent Liabilities and Contingent Assets [Abstract] | |||
| Defined benefit obligation at Dec. 31 | $ 4,348,071 | SFr 3,939,184 | |
| Interest expense on defined benefit obligation | 46,230 | SFr 38,355 | |
| Current service cost (employer) | 180,842 | 150,038 | |
| Contributions by plan participants | 172,442 | 143,069 | |
| Benefits (paid) / deposited | (603,125) | (500,391) | |
| Administration cost (excl. cost for managing plan assets) | 2,374 | 1,970 | |
| Actuarial (gain) / loss on defined benefit obligation | (131,148) | (108,809) | |
| Foreign exchange impact | 605,713 | SFr 0 | |
| Defined benefit liability at Dec. 31 | $ 4,621,399 | SFr 3,663,416 |