Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Schedule of Disaggregated Revenues by Source (Details)

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REVENUES - Schedule of Disaggregated Revenues by Source (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Total revenues $ 58,480,602 $ 42,203,579
Storage tank and vessel    
Disaggregation Of Revenue [Line Items]    
Total revenues 5,775,772 6,273,840
Seamless carbon steel pipe and tube    
Disaggregation Of Revenue [Line Items]    
Total revenues 8,432,613 5,721,475
Stainless steel pipe    
Disaggregation Of Revenue [Line Items]    
Total revenues 31,283,862 17,714,645
Specialty chemicals    
Disaggregation Of Revenue [Line Items]    
Total revenues $ 12,988,355 $ 12,493,619