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Accounts Receivable (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
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

X

- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

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+ References

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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