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Accounts Receivable (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Summary of accounts receivable |  |
Total gross receivables | $ 3,880,762 | $ 3,431,522
Less: allowance for credit losses | (963,116) | (795,914)
Total net receivables | 2,917,646 | 2,635,608
Total net receivables | 2,917,646 | 2,635,608
Construction services [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 2,293,187 | 1,391,555
Engineering services [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 86,388 | 86,264
Medical [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 679,446 | 1,157,819
Retainage receivable [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 635,049 | 615,136
Other receivable [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | $ 186,692 | $ 180,748

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