Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable (Details)

v3.19.1
Accounts Receivable (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Summary of accounts receivable      
Total gross receivables $ 3,796,509 $ 2,586,221 $ 14,723
Less: allowance for doubtful accounts (839,895) (839,895)  
Total net receivables 2,956,614 1,746,326  
Block sales [Member]      
Summary of accounts receivable      
Total gross receivables    
Construction revenue [Member]      
Summary of accounts receivable      
Total gross receivables 2,826,999 1,619,498  
Engineering services [Member]      
Summary of accounts receivable      
Total gross receivables 416,894 400,877  
Retainage receivable [Member]      
Summary of accounts receivable      
Total gross receivables 544,910 543,417  
Other receivable [Member]      
Summary of accounts receivable      
Total gross receivables $ 7,706 $ 7,706