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Accounts Receivable (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Summary of accounts receivable |  |  |
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
Block sales [Member] |  |  |
Summary of accounts receivable |  |  |
Total gross receivables |  | 14,723 |
Construction revenue [Member] |  |  |
Summary of accounts receivable |  |  |
Total gross receivables |  | 1,619,498 | 2,470,526
Engineering services [Member] |  |  |
Summary of accounts receivable |  |  |
Total gross receivables |  | 400,877 | 196,008
Retainage receivable [Member] |  |  |
Summary of accounts receivable |  |  |
Total gross receivables |  | 543,417 | 373,576
Other receivable [Member] |  |  |
Summary of accounts receivable |  |  |
Total gross receivables |  | $ 7,706 |
[1] | The change in allowance for doubtful accounts is primarily due to unpaid billings on a contract that is currently in dispute.

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