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Intangible assets, net (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Subtotal | $ 4,807,569 | $ 5,052,294
Less: Accumulated amortization | (4,615,716) | (4,846,323)
Intangible assets, net | 191,853 | 205,971
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Subtotal | 29,345 | 30,838
Land use rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Subtotal | 299,224 | 314,456
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Subtotal | $ 4,479,000 | $ 4,707,000

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