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Accounts Receivable (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Summary of accounts receivable |  |
Total gross receivables | $ 2,773,109 | $ 3,040,110
Less: allowance for doubtful accounts | (14,904) | (34,235)
Total net receivables | 2,758,205 | 3,005,875
Block sales [Member] |  |
Summary of accounts receivable |  |
Total gross receivables |  | 14,038
Construction services [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 2,228,939 | 2,652,496
Retainage receivable [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | 543,417 | 373,576
Other receivable [Member] |  |
Summary of accounts receivable |  |
Total gross receivables | $ 753 |

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