Annual report pursuant to Section 13 and 15(d)

Income taxes (Details)

Income taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Percentage of Income tax at an effective rate 25.00%  
Cumulative Earnings (Deficit) $ 2,591,758  
Federal and state net operating loss carryforwards $ 38,420,422 $ 30,557,167
Net operating loss carry-forward expiration date As of December 31, 2021, the Company has $35,932,868 of U.S. federal net operating loss carryovers that have no expiration date, and $2,487,554 of the federal net operating loss and state net operating loss carry-forwards begin to expire in 2034.  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic $ 2,566,087  
Net operating loss carryforwards 61,847  
Penalty $ 10,000  
Income tax, description The Company has not been audited by any jurisdiction since its inception. The Company is open for audit by the U.S. Internal Revenue Service and U.S. state tax jurisdictions from 2018 to 2021, and open for audit by the Chinese Ministry of Finance from 2017 to 2021.