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Property, Plant and Equipment, Net | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment, Net [Abstract] |
Property, plant and equipment, net | (6) Property, plant and equipment, net As of September 30, 2025 and December 31, 2024, property, plant and equipment consisted of the following:
|  | September 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Land use rights |  | $ | 81,243,077 |  |  | $ | 80,306,144 |
Building and improvements |  |  | 67,357,592 |  |  |  | 66,580,793 |
Machinery and equipment |  |  | 158,001,509 |  |  |  | 156,179,361 |
Vehicles |  |  | 334,878 |  |  |  | 343,088 |
Totals |  |  | 306,937,056 |  |  |  | 303,409,386 |
Less: accumulated depreciation and amortization |  |  | (169,033,642 | ) |  |  | (156,497,503 | )
Property, Plant and Equipment, net |  | $ | 137,903,414 |  |  | $ | 146,911,883 |
As of September 30, 2025 and December 31, 2024, land use rights represented twenty four 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. As of September 30, 2025 and December 31, 2024, certain property, plant and equipment of Dongfang Paper with net values of $nil, have been pledged pursuant to a long-term loan from credit union of Dongfang Paper. Certain property, plant and equipment of Baoding Shengde with net value of $2,282,024 and $3,407,848, respectively, as of September 30, 2025 and December 31, 2024, have been pledged pursuant two short-term loans from credit union of Baoding Shengde. Certain property, plant and equipment of Dongfang Paper with net values of $132,208 was pledged for a short-term loan from Bank of Cangzhou. Certain property, plant and equipment of Dongfang Paper with net values of $222,500 was pledged for another short-term loan from Bank of Cangzhou. See “Short-term bank loans” under Note (8), Loans Payable, for details of the transaction and asset collaterals. Depreciation and amortization of property, plant and equipment was $3,574,417 and $3,483,298 for the three months ended September 30, 2025 and 2024, respectively. Depreciation and amortization of property, plant and equipment was $10,664,999 and $10,346,181 for the nine months ended September 30, 2025 and 2024, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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