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Accounts Receivable | 12 Months Ended
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Dec. 31, 2018
Accounts Receivable [Abstract] |
Accounts Receivable |
4. | Accounts Receivable
At December 31, 2018 and 2017, the Company’s accounts receivable consisted of the following:
|  |  | 2018 |  |  | 2017 |
| Billed: |  |  |  |  |  |
| Block sales |  | $ | 14,723 |  |  | $ | — |
| Construction services |  |  | 1,619,498 |  |  |  | 2,470,526 |
| Engineering services |  |  | 400,877 |  |  |  | 196,008 |
| Retainage receivable |  |  | 543,417 |  |  |  | 373,576 |
| Other receivable |  |  | 7,706 |  |  |  | — |
| Total gross receivables |  |  | 2,586,221 |  |  |  | 3,040,110 |
| Less: allowance for doubtful accounts (1) |  |  | (839,895 | ) |  |  | (34,235 | )
| Total net receivables |  | $ | 1,746,326 |  |  | $ | 3,005,875 |
| (1) The change in 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 $34,235 as of December 31, 2017. The provision for doubtful accounts was $810,580 for 2018 and write offs were $4,920. The was no provision for doubtful accounts in 2017 and no write offs.

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- Definition The entire disclosure for financing receivables. Examples of financing receivables include, but are not limited to, loans, trade accounts receivables, notes receivable, credit cards, and receivables relating to a lessor's right(s) to payment(s) from a lease other than an operating lease that is recognized as assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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- References No definition available. + Details
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