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Construction Backlog | 9 Months Ended
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Sep. 30, 2018
Construction Backlog [Abstract] |
Construction Backlog |
10. | Construction Backlog
The following represents the backlog of signed construction and engineering contracts in existence at September 30, 2018 and December 31, 2017, which represents the amount of revenue the Company expects to realize from work to be performed on uncompleted contracts in progress and from contractual agreements in effect at September 30, 2018 and December 31, 2017, respectively, on which work has not yet begun:
|  | September 30, 2018 |  |  | December 31, 2017 |
Balance – beginning of period |  | $ | 76,659,029 |  |  | $ | 541,291 |
New contracts and change orders during the period |  |  | 32,112,767 |  |  |  | 81,179,323 |
Subtotal |  |  | 108,771,796 |  |  |  | 81,720,614 |
Less: contract revenue earned during the period |  |  | (5,932,150 | ) |  |  | (5,061,585 | )
Balance – end of period |  | $ | 102,839,646 |  |  | $ | 76,659,029 |
Backlog at September 30, 2018 includes two large contracts entered into by the Company during the third quarter of 2017 and one contract during the first quarter of 2018 in the amounts of approximately $55 million, $15 million, and $27 million, respectively. The Company expects that all of this revenue will be realized by December 31, 2020.

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