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Accounts Receivable | 3 Months Ended
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Mar. 31, 2021
Accounts Receivable [Abstract] |
Accounts Receivable |
4. | Accounts Receivable
At March 31, 2021 and December 31, 2020, the Company’s accounts receivable consisted of the following:
|  |  | 2021 |  |  | 2020 |
| Billed: |  |  |  |  |  |
| Construction services |  | $ | 2,049,179 |  |  | $ | 1,391,555 |
| Engineering services |  |  | 68,223 |  |  |  | 86,264 |
| Medical revenue |  |  | 1,098,271 |  |  |  | 1,157,819 |
| Retainage receivable |  |  | 615,136 |  |  |  | 615,136 |
| Other receivable |  |  | 182,012 |  |  |  | 180,748 |
| Total gross receivables |  |  | 4,012,821 |  |  |  | 3,431,522 |
| Less: allowance for credit losses |  |  | (795,914 | ) |  |  | (795,914 | )
| Total net receivables |  | $ | 3,216,907 |  |  | $ | 2,635,608 |
Receivables are evaluated for collectability and allowances for potential losses are established or maintained on applicable receivables. The allowance of doubtful accounts was $795,914 as of March 31, 2021. There was no provision for doubtful accounts, no recoveries collected for doubtful accounts and no write offs during the three months ended March 31, 2021. There was a provision for doubtful accounts of $10,018, and no write offs for the year ended December 31, 2020.

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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- References No definition available. + Details
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