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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

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- Definition The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Value of land use right pledged for sale leaseback financing. + References No definition available. + Details
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- Definition A description of how an entity determined the fair value of the long-lived asset being disposed of by a method other than sale, for example, whether based on a quoted market price, prices for similar assets, or another valuation technique. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI https://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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