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Revenues - Schedule of Disaggregated Revenues by Source (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 71,893,763 | $ 51,511,045 | $ 130,374,365 | $ 93,714,624
Storage tank and vessel |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9,071,649 | 6,057,865 | 14,847,421 | 12,331,705
Seamless carbon steel pipe and tube |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8,403,288 | 6,391,212 | 16,835,901 | 12,112,688
Stainless steel pipe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 38,899,542 | 26,639,245 | 70,183,404 | 44,353,889
Specialty chemicals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 15,519,284 | $ 12,422,723 | $ 28,507,639 | $ 24,916,342

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