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PRC statutory reserves (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statutory Reserve Fund
Statutory reserve	$ 2,452,000	$ 3,174,000	$ 3,174,000
Minimum Registered capital percentage	25.00%
Registered capital percentage	50.00%
Net income statutory reserve fund	10.00%
Statutory Staff Welfare Fund
Statutory reserve	$ 12,000	12,000
Enterprise Expansion Fund
Statutory reserve	$ 408,000	$ 408,000
Minimum Registered capital percentage	25.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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