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Summary of significant accounting policies (Details Narrative)
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Jan. 02, 2022
USD ($)
Product Information [Line Items]        
Accumulated other comprehensive loss $ 2,210,909 $ 2,009,421    
Allowance for credit loss 9,267,851 3,009,363    
Allowance for credit loss 468,219 500,857    
Bad debt expense for other receivable 25,829 34,189 $ 144,415  
Impairment loss 0 0    
Prepayments 100,000      
Allowance for doubtful account prepayment 105,769 173,736    
Impairment of long-lived assets 0 0    
Cash deposited into escrow 600,000  
Escrow 600,000 0    
Advertising costs 6,053 22,677 61,566  
R&D expenses $ 61,786 $ 80,948 $ 112,668  
Potential dilutive shares | shares 0 0 0  
Expenses $ 83,687 $ 166,199 $ 171,674  
ROU assets $ 210,058   $ 201,180
Operating lease liabilities       $ 201,180
Sewage Treatment Services [Member]        
Product Information [Line Items]        
Revenue remaining performance obligations 953,170      
Sewage Treatment Services 1 [Member]        
Product Information [Line Items]        
Revenue remaining performance obligations $ 0      
China, Yuan Renminbi        
Product Information [Line Items]        
Foreign currency exchange rate, translation 7.19 7.08    
Foreign currency average translation rates 7.14 7.05 6.73  
Hong Kong, Dollars        
Product Information [Line Items]        
Foreign currency exchange rate, translation 7.77 7.81    
Foreign currency average translation rates 7.80 7.83 7.83