Derivative liabilities (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes and other explanatory information [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of changes in fair value of derivative liabilities | Changes in the fair value of the derivative liabilities for the year ended December 31, 2025 and 2024 are summarized as follows:
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| Schedule of fair value of the derivative liabilities | The fair value of the derivative liabilities was estimated using the Black-Scholes Option Pricing Model with the following weighted average assumptions:
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