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Accounts Receivable (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Summary of accounts receivable |  |
Total gross receivables | $ 4,523,732 | $ 3,431,522
Less: allowance for doubtful accounts | (957,116) | (795,914)
Total net receivables | 3,566,616 | 2,635,608
Construction services [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 3,066,890 | 1,391,555
Engineering services [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 34,919 | 86,264
Medical [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 408,619 | 1,157,819
Retainage receivable [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 615,136 | 615,136
Other receivable [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | $ 398,168 | $ 180,748

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