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Schedule of cash and cash equivalents (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]        
Cash on hand and petty cash $ 3,517 $ 1,980    
Checking accounts and demand deposits 94,152 647,126    
Cash and cash equivalents $ 97,669 $ 649,106 $ 559,462 $ 2,949,108