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Accounts Receivable | 12 Months Ended
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Dec. 31, 2023
Accounts Receivable |
Accounts Receivable |
5. | Accounts Receivable
At December 31, 2023, 2022 and 2021, the Company’s accounts receivable consisted of the following:
|  |  | 2023 |  |  | 2022 |  |  |  | 2021 |
| Billed: |  |  |  |  |  |  |  |  |  |
| Construction services | $ | 819,887 |  |  | $ | 1,310,456 |  |  | $ | 2,293,187 |
| Engineering services |  | — |  |  |  | — |  |  |  | 86,388 |
| Medical revenue |  | — |  |  |  | — |  |  |  | 679,446 |
| Retainage receivable |  | — |  |  |  | — |  |  |  | 635,049 |
| Other receivable |  | — |  |  |  | 115,746 |  |  |  | 186,692 |
| Total gross receivables |  | 819,887 |  |  |  | 1,426,202 |  |  |  | 3,880,762 |
| Less: allowance for credit losses |  | (637,134 | ) |  |  | (145,746 | ) |  |  | (963,116 | )
| Total net receivables | $ | 182,753 |  |  | $ | 1,280,456 |  |  | $ | 2,917,646 |
Receivables are evaluated for collectability and allowances for potential losses are established or maintained on applicable receivables.

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