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Accounts Receivable | 12 Months Ended
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Dec. 31, 2020
Accounts Receivable [Abstract] |
Accounts Receivable |
4. | Accounts Receivable
At December 31, 2020 and 2019, the Company’s accounts receivable consisted of the following:
|  |  | 2020 |  |  | 2019 |
| Billed: |  |  |  |  |  |
| Construction services | $ | 1,391,555 |  |  | $ | 1,321,575 |
| Engineering services |  | 86,264 |  |  |  | 14,594 |
| Medical revenue |  | 1,157,819 |  |  |  | — |
| Retainage receivable |  | 615,136 |  |  |  | 544,911 |
| Other receivable |  | 180,748 |  |  |  | 6,000 |
| 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 |
Receivables are evaluated for collectability and allowances for potential losses are established or maintained on applicable receivables. The allowance for doubtful accounts was $795,914 as of December 31, 2020. There was a provision for doubtful accounts of $10,018, and no write offs for the year ended December 31, 2020. There was no provision for doubtful accounts and write offs were $54,000 for the year ended December 31, 2019.

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