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v3.19.2

Construction Backlog (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Schedule of backlog of signed construction and engineering contracts |
|  |  | June 30, 2019 |  |  | December 31, 2018 |
| Balance - beginning of period |  | $ | 97,657,379 |  |  | $ | 76,659,029 |
| New contracts and change orders during the period, net |  |  | 145,745 |  |  |  | 58,805,877 |
| Adjustments and cancellations, net |  |  | (24,571,359 | ) |  |  | (29,616,815 | )
| Subtotal |  |  | 73,231,765 |  |  |  | 105,848,091 |
| Less: contract revenue earned during the period |  |  | (2,463,032 | ) |  |  | (8,190,712 | )
| Balance - end of period |  | $ | 70,768,733 |  |  | $ | 97,657,379 |
Construction Backlog [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Schedule of expects to satisfy remaining unsatisfied performance obligation |
|  |  | 2019 |
| Within 1 year |  | $ | 14,324,626 |
| 1 to 2 years |  |  | 34,500,000 |
| Thereafter |  |  | 21,944,107 |
| Total Backlog |  | $ | 70,768,733 |

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