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Credit facilities (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Short term loans third parties	$ 836,765	$ 312,028
Lou Hong [Member]
Line of Credit Facility [Line Items]
Short term loans third parties maturities descriptions	September 30, 2025
Short term loans third parties interest rate	0.00%
Short term loans third parties collateral guarantee descriptions	None
Short term loans third parties	$ 626,009
Lingyu Ye [Member]
Line of Credit Facility [Line Items]
Short term loans third parties maturities descriptions	December 2019 (renewed in December 2020, extended to December 2024)
Short term loans third parties interest rate	0.00%
Short term loans third parties collateral guarantee descriptions	None
Short term loans third parties		28,237
Runze Li [Member]
Line of Credit Facility [Line Items]
Short term loans third parties maturities descriptions	December 31, 2025
Short term loans third parties interest rate	0.00%
Short term loans third parties collateral guarantee descriptions	None
Short term loans third parties	$ 2,086	43,769
Shanghai Xinjing Construction Labor Service Center [Member]
Line of Credit Facility [Line Items]
Short term loans third parties maturities descriptions	November 30, 2025
Short term loans third parties interest rate	0.00%
Short term loans third parties collateral guarantee descriptions	None
Short term loans third parties	$ 208,670	211,784
Xiamen Haosheng Investing Co Ltd [Member]
Line of Credit Facility [Line Items]
Short term loans third parties maturities descriptions	April 2020 (extended to April 2024)
Short term loans third parties interest rate	0.00%
Short term loans third parties collateral guarantee descriptions	None
Short term loans third parties		$ 28,238

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

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