Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Mar. 31, 2008
Liabilities [Abstract]      
Term loan secured by plant, pipeline and equipment     $ 10,000
Recurring [Member]      
Liabilities [Abstract]      
Interest rate swap $ 122 $ 177  
Recurring [Member] | Level 1 [Member]      
Liabilities [Abstract]      
Interest rate swap 0 0  
Recurring [Member] | Level 2 [Member]      
Liabilities [Abstract]      
Interest rate swap 122 177  
Recurring [Member] | Level 3 [Member]      
Liabilities [Abstract]      
Interest rate swap $ 0 $ 0