Fair value measurements - Schedule of fair value on a recurring basis (Details) - USD ($) |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Current assets: | ||
| Cash and cash equivalents | $ 8,705,218 | $ 4,164,323 |
| Liabilities: | ||
| Debentures | 5,245,543 | 0 |
| Fair Value, Recurring [Member] | ||
| Current assets: | ||
| Cash and cash equivalents | 8,705,218 | 4,164,323 |
| Total assets measured at fair value | 8,705,218 | 4,164,323 |
| Fair Value, Recurring [Member] | Level 1 [Member] | ||
| Current assets: | ||
| Cash and cash equivalents | 8,705,218 | 4,164,323 |
| Total assets measured at fair value | 8,705,218 | 4,164,323 |
| Fair Value, Recurring [Member] | Level 2 [Member] | ||
| Current assets: | ||
| Cash and cash equivalents | 0 | 0 |
| Total assets measured at fair value | 0 | 0 |
| Fair Value, Recurring [Member] | Level 3 [Member] | ||
| Current assets: | ||
| Cash and cash equivalents | 0 | 0 |
| Total assets measured at fair value | $ 0 | $ 0 |