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Schedule of cost of inventories (Details) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Notes and other explanatory information [abstract]      
Cost of goods sold $ 4,540,840 $ 11,921,857 $ 20,893,411
provision (reversal) for allowance for valuation loss 19,513 11,324 (37,569)
Cost of inventories $ 4,560,353 $ 11,933,181 $ 20,855,842