Accounts Receivable (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Summary of accounts receivable
Total gross receivables	$ 3,431,522	$ 1,887,080
Less: allowance for doubtful accounts	(795,914)	(785,895)
Total net receivables	2,635,608	1,101,185
Construction service [Member]
Summary of accounts receivable
Total gross receivables	1,391,555	1,321,575
Engineering services [Member]
Summary of accounts receivable
Total gross receivables	86,264	14,594
Medical [Member]
Summary of accounts receivable
Total gross receivables	1,157,819
Retainage receivable [Member]
Summary of accounts receivable
Total gross receivables	615,136	544,911
Other receivable [Member]
Summary of accounts receivable
Total gross receivables	$ 180,748	$ 6,000

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant