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v3.21.1

Construction Backlog (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Schedule of backlog of signed construction and engineering contracts |
|  |  | 2021 |  |  | 2020 |
| Balance - beginning of period |  | $ | 25,117,461 |  |  | $ | 17,634,261 |
| New contracts and change orders during the period |  |  | 1,047,324 |  |  |  | 13,816,785 |
| Adjustments and cancellations, net |  |  | — |  |  |  | (27,370 | )
| Subtotal |  |  | 26,164,785 |  |  |  | 31,423,676 |
| Less: contract revenue earned during the period |  |  | (3,293,305 | ) |  |  | (6,306,215 | )
| Balance - end of period |  | $ | 22,871,480 |  |  | $ | 25,117,461 |
Construction Backlog [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Summary of expects to satisfy remaining unsatisfied performance obligation |
|  |  | 2021 |
| Within 1 year |  | $ | 10,015,230 |
| 1 to 2 years |  |  | 12,856,250 |
| Total Backlog |  | $ | 22,871,480 |

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