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Property, plant and equipment, net (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, plant and equipment, net (Details) [Line Items]      
Term of lease, description As of March 31, 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 $ 8,553,369   $ 8,614,194
Depreciation and amortization 4,089,067 $ 3,774,674  
Dongfang Paper [Member]      
Property, plant and equipment, net (Details) [Line Items]      
Amount of property, plant and equipment net value 1,882,319   2,349,796
Land use right net values 5,931,823   6,010,359
Hebei Tengsheng [Member]      
Property, plant and equipment, net (Details) [Line Items]      
Land use right net values $ 5,520,886   $ 5,560,146