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Accounts Receivable (Tables) | 9 Months Ended
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Sep. 30, 2019
Accounts Receivable [Abstract] |
Schedule of accounts receivable |
|  |  | 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.

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- References No definition available. + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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