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Other receivables, net - (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Receivables from sales of short-term investment	$ 6,788,622
Others	682,268	110,846
Total other receivables	7,470,890	110,846
Allowance for doubtful accounts	(11,225)	(11,801)
Total other receivables, net	7,459,665	99,045
Less: other receivables, net - discontinued operations	(97,768)	(99,045)
Total other receivables, net - continuing operations	$ 7,361,897

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- References

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- Definition

Amount due from parties in nontrade transactions, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(5)(a)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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