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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities |  |  |
Net (loss) income | $ (571,717) | $ 756,761 | $ 2,841,134
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities |  |  |
Depreciation expense | 365,366 | 248,146 | 174,440
Amortization expense | 10,269 | 15,118 | 12,086
Provision for credit losses or doubtful accounts | 217,471 | 190,983 | 22,837
Write-down of inventories | 129,686 | 6,713 | 42,544
Deferred tax expense (benefits) | 0 | 74,616 | (14,816)
Amortization of operating lease right-of-use assets | 261,754 | 154,455 | 120,053
Amortization of finance lease right-of-use assets | 11,951 | 0 | 12,296
Loss from disposal of property and equipment | 1,046 | 0 | 3,310
Changes in operating assets and liabilities |  |  |
Accounts and notes receivable | 1,019,565 | (1,371,684) | 651,386
Accounts receivable - related parties | (16,938) | (218,421) | 60,552
Prepayments | (530,103) | 275,082 | 221,842
Prepayments - related parties | (2,889,728) | (1,004,692) | (3,117)
Inventories | (117,157) | (909,054) | 300,042
Other receivables and other current assets | (335,891) | (52,168) | 275,108
Prepaid expenses and deposits | (57,373) | (1,107) | (23,274)
Operating lease receivable - related party | 0 | 0 | 104,540
Accounts payable | 345,455 | (25,698) | (386,154)
Accounts payable - related party | (411,139) | 392,777 | 57,673
Contract liabilities | 2,244,964 | 2,146,876 | (702,924)
Accrued expenses and other payables | 201,624 | 307,405 | (226,528)
Operating lease liabilities | (132,525) | (34,652) | 0
Operating lease liabilities - related parties | (102,751) | (204,940) | (155,005)
Other payables - related parties | 18,794 | 0 | 0
Taxes payable | (474,512) | (295,495) | 250,042
Net cash (used in) provided by operating activities | (811,889) | 451,021 | 3,638,067
Cash flows from investing activities |  |  |
Purchases of property, plant and equipment | (450,637) | (43,254) | (145,699)
Purchase of intangible assets | (15,170) | (37,993) | 0
Prepayment for land use right | (2,016,296) | 0 | 0
Deposit for long-term investment | 0 | 0 | (222,916)
Loans to related parties | (301,949) | (677,765) | (1,655,820)
Repayments from related parties | 0 | 677,267 | 1,920,315
Net cash used in investing activities | (2,784,052) | (81,745) | (104,120)
Cash flows from financing activities |  |  |
Borrowings from related parties | 178,860 | 1,587,015 | 250,166
Repayments to related parties | 0 | (1,511,509) | (1,956,190)
Repayments from loans receivable - related parties | 0 | 0 | 3,812,241
Proceeds from bank loan | 0 | 282,450 | 762,372
Repayments to bank loan | (795,394) | (1,218,164) | (1,264,754)
Repayments to third party loans | 0 | (194,226) | (195,317)
Repayments to related party loans | 0 | 0 | (435,193)
Repayments of finance lease liabilities | (119,223) | 0 | (36,097)
Dividends payments | (517,140) | (1,275,902) | (1,654,389)
Capital contribution from noncontrolling interest shareholder | 50,000 | 0 | 0
Proceeds from issuance of shares upon IPO | 5,000,000 | 0 | 0
Proceeds from issuance of shares pursuant to exercise of over-allotment | 413,940 | 0 | 0
Payments of initial public offering costs | (1,418,521) | (474,972) | (680,125)
Net cash provided by (used in) financing activities | 2,792,522 | (2,805,308) | (1,397,286)
Effect of exchange rate change on cash and restricted cash | (526,628) | 108,141 | (342,913)
Net change in cash and restricted cash | (1,330,047) | (2,327,891) | 1,793,748
Cash and restricted cash - beginning of the year | 10,802,405 | 13,130,296 | 11,336,548
Cash and restricted cash - end of the year | 9,472,358 | 10,802,405 | 13,130,296
Cash | 8,968,814 | 10,802,405 | 13,130,296
Restricted cash | 503,544 | 0 | 0
Supplemental disclosure of cash flow information |  |  |
Interest paid | 66,864 | 91,276 | 155,054
Income tax paid | 746,044 | 664,259 | 390,936
Supplemental non-cash information |  |  |
Finance lease right-of-use assets obtained in exchange for finance lease liabilities | 235,556 | 0 | 0
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 1,013,605 | 391,309 | 119,662
Termination of operating lease right-of-use asset with lease liability | (27,667) | 0 | 0
Other receivables - related party offset with other payables - related party upon execution of offset agreement | 0 | 381,710 | 0
Dividends declared to offset with loans receivable - related parties upon execution of offset agreement | 0 | 0 | 951,209
Deferred IPO costs transfer to additional paid-in capital upon IPO | $ (1,192,734) | $ 0 | $ 0

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- Definition The cash outflow to settle a bank borrowing during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Cash outflows under financing arrangements with vendors (seller-financed debt), which had a maturity date at inception of more than one year (or more than one operating cycle, if longer); such debt may have arisen from purchases of property, plant and equipment or other productive assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (c) -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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