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v3.20.1

Construction Backlog (Tables) | 3 Months Ended
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Mar. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Schedule of backlog of signed construction and engineering contracts |
|  |  | 2020 |  |  | 2019 |
| Balance - beginning of period |  | $ | 17,634,261 |  |  | $ | 97,657,379 |
| New contracts and change orders during the period |  |  | 73,838 |  |  |  | 17,659,053 |
| Adjustments and cancellations, net |  |  | (27,370 | ) |  |  | (94,697,336 | )
| Subtotal |  |  | 17,680,729 |  |  |  | 20,619,096 |
| Less: contract revenue earned during the period |  |  | (198,756 | ) |  |  | (2,984,835 | )
| Balance - end of period |  | $ | 17,481,973 |  |  | $ | 17,634,261 |
Construction Backlog [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Summary of expects to satisfy remaining unsatisfied performance obligation |
|  |  | 2020 |
| Within 1 year |  | $ | 2,054,473 |
| 1 to 2 years |  |  | 10,285,000 |
| Thereafter |  |  | 5,142,500 |
| Total Backlog |  | $ | 17,481,973 |

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