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COMMITMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
COMMITMENTS      
Rental expense $ 793 $ 785 $ 703
Operating lease commitments, due 2019 603    
Operating lease commitments, due 2020 555    
Operating lease commitments, due 2021 342    
Operating lease commitments, due 2022 $ 67