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Property, plant and equipment, net (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Property, plant and equipment, net (Details) [Line Items]      
Term of lease, description As of March 31, 2022 and December 31, 2021, land use rights represented twenty three 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 2068, respectively.     
Land use right net values pledged for sale-leaseback financing $ 5,990,831   $ 6,002,195
Net value 4,417,524   4,407,889
Depreciation and amortization 3,773,236 $ 4,089,067  
Dongfang Paper [Member]      
Property, plant and equipment, net (Details) [Line Items]      
Property, plant and equipment net value $ 928,347   $ 1,130,333
Hebei Tengsheng [Member]      
Property, plant and equipment, net (Details) [Line Items]      
Land use right net value $5,704,148   $5,690,261