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v3.19.1

Construction Backlog (Details 1) | Dec. 31, 2018 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Total Remaining Unsatisfied Performance Obligations | $ 97,657,379
Within 1 year [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Total Remaining Unsatisfied Performance Obligations | 22,563,674
1 to 2 years [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Total Remaining Unsatisfied Performance Obligations | 54,639,417
Thereafter [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Total Remaining Unsatisfied Performance Obligations | $ 20,454,288

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