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Property, plant and equipment, net (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Property, plant and equipment, net (Details) [Line Items] |  |  |  |  |
Term of lease, description |  |  | As of September 30, 2021 and December 31, 2020, land use rights represented two parcels of state-owned lands located in Xushui District and Wei County of Hebei Province in China, with lease terms of 50 years expiring in 2061 and 2066, respectively. |  |
Land use right net values | $ 8,666,660 |  | $ 8,666,660 |  | $ 8,614,194
Depreciation and amortization of property, plant and equipment | 3,500,145 | $ 3,805,389 | 11,659,670 | $ 11,301,703 |
Dongfang Paper [Member] |  |  |  |  |
Property, plant and equipment, net (Details) [Line Items] |  |  |  |  |
Amount of property, plant and equipment net value | 1,313,720 |  | 1,313,720 |  | 2,349,796
Land use right net values | 5,937,242 |  | 5,937,242 |  | 6,010,359
Hebei Tengsheng [Member] |  |  |  |  |
Property, plant and equipment, net (Details) [Line Items] |  |  |  |  |
Land use right net values | $ 5,594,011 |  | $ 5,594,011 |  | $ 5,560,146

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