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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