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Summary of significant accounting policies (Tables)
9 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]  
Schedule of assets and liabilities by level measured at fair value on a recurring basis
   September 30, 2022   December 31, 2021 
Description  Level 1   Level 2   Level 3   Level 1   Level 2   Level 3 
Assets                        
Marketable securities  $369,850    
    
   $1,327,440