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Accounts Receivable | 9 Months Ended
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Sep. 30, 2019
Accounts Receivable [Abstract] |
Accounts Receivable |
4. | Accounts Receivable
At September 30, 2019 and December 31, 2018, the Company’s accounts receivable consisted of the following:
|  |  | September 30, 2019 |  |  | December 31, 2018 |
| Billed: |  |  |  |  |  |
| Block sales |  | $ | — |  |  | $ | 14,723 |
| Construction services |  |  | 1,306,567 |  |  |  | 1,619,498 |
| Engineering services |  |  | 333,230 |  |  |  | 400,877 |
| Retainage receivable |  |  | 544,911 |  |  |  | 543,417 |
| Other receivable |  |  | 37,526 |  |  |  | 7,706 |
| Total gross receivables |  |  | 2,222,234 |  |  |  | 2,586,221 |
| Less: allowance for doubtful accounts (1) |  |  | (785,895 | ) |  |  | (839,895 | )
| Total net receivables |  | $ | 1,436,339 |  |  | $ | 1,746,326 |
| (1) The allowance for doubtful accounts is primarily due to unpaid billings on a contract that is currently in dispute.
Receivables are evaluated for collectability and allowances for potential losses are established or maintained on applicable receivables. The allowance for doubtful accounts was $785,895 as of September 30, 2019. There was no provision for doubtful accounts, $54,000 collected for doubtful accounts and no write offs for the nine months ended September 30, 2019. The provision for doubtful accounts was $810,580 and write offs were $4,920 for the year ended December 31, 2018.

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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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