Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Details)

v3.7.0.1
DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Unrealized gain (loss) $ (2) $ (8) $ 1 $ (14)  
Realized loss 18 $ 33 38 $ 70  
Interest Rate Swaps [Member]          
Derivative [Line Items]          
Term loan in pay fixed, receive variable interest rate swap 10,000   10,000    
Term loan secured by plant, pipeline and equipment 14,000   14,000    
Notional amount $ 1,250   $ 1,250   $ 1,750
Derivative, variable interest rate 5.83%   5.83%    
Fair value of interest rate swap - liability $ 19   $ 19   $ 58