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v3.19.1

Construction Backlog (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Schedule of backlog of signed construction and engineering contracts |
|  |  | 2018 |  |  | 2017 |
| Balance - beginning of period |  | $ | 76,659,029 |  |  | $ | 541,291 |
| New contracts and change orders during the period |  |  | 29,189,062 |  |  |  | 81,179,323 |
| Subtotal |  |  | 105,848,091 |  |  |  | 81,720,614 |
| Less: contract revenue earned during the period |  |  | (8,190,712 | ) |  |  | (5,061,585 | )
| Balance - end of period |  | $ | 97,657,379 |  |  | $ | 76,659,029 |
Construction Backlog [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Schedule of expects to satisfy remaining unsatisfied performance obligation |
|  |  | 2018 |
| Within 1 year |  | $ | 22,563,674 |
| 1 to 2 years |  |  | 54,639,417 |
| Thereafter |  |  | 20,454,288 |
| Total Backlog |  | $ | 97,657,379 |

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