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Activities in allowance for doubtful accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Accounts Receivable, Allowance for Credit Loss, Beginning Balance $ 40,651 $ 40,651
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 40,651 $ 40,651