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Short-term bank loans (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Short-term Bank Loans and Notes Payable | $ 4,719,552 | $ 5,564,790
Loan payable One [Member] | Loan payable to Bank of China Lishui Branch [Member] |  |
Short-term Bank Loans and Notes Payable | 2,679,852 | 2,958,690
Loan payable Two [Member] | Loan payable to Shanghai Pudong Development ("SPD") Bank Lishui Branch [Member] |  |
Short-term Bank Loans and Notes Payable | $ 2,039,700 | $ 2,606,100

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