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Prepayments and other current assets (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Prepayments and other current assets (Details) [Line Items] |  |  |  |  |
Term of lease, description |  |  | As of June 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 | $ 8,700,601 |  | $ 8,700,601 |  | $ 8,614,194
Other Depreciation and Amortization | 4,070,458 | $ 3,721,640 | 8,159,525 | $ 7,496,314 |
Dongfang Paper [Member] |  |  |  |  |
Prepayments and other current assets (Details) [Line Items] |  |  |  |  |
Amount of property, plant and equipment net value | 1,522,164 |  | 1,522,164 |  | 2,349,796
Land use right net values | 5,997,212 |  | 5,997,212 |  | 6,010,359
Hebei Tengsheng [Member] |  |  |  |  |
Prepayments and other current assets (Details) [Line Items] |  |  |  |  |
Land use right net values | $ 5,615,919 |  | $ 5,615,919 |  | $ 5,560,146

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