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Accounts Receivable (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of accounts receivable |  |  |
Total gross receivables |  | $ 2,234,401 | $ 2,586,221
Less: allowance for doubtful accounts | [1] | (785,895) | (839,895)
Total net receivables |  | 1,448,506 | 1,746,326
Block sales [Member] |  |  |
Schedule of accounts receivable |  |  |
Total gross receivables |  |  | 14,723
Construction services [Member] |  |  |
Schedule of accounts receivable |  |  |
Total gross receivables |  | 1,373,493 | 1,619,498
Engineering services [Member] |  |  |
Schedule of accounts receivable |  |  |
Total gross receivables |  | 307,991 | 400,877
Retainage receivable [Member] |  |  |
Schedule of accounts receivable |  |  |
Total gross receivables |  | 544,911 | 543,417
Other receivable [Member] |  |  |
Schedule of accounts receivable |  |  |
Total gross receivables |  | $ 8,006 | $ 7,706
[1] | The allowance for doubtful accounts is primarily due to unpaid billings on a contract that is currently in dispute.

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