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ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
Dec. 31, 2018
ACCOUNTS RECEIVABLE  
Schedule of accounts receivable
December 31,   2018     2017  
(in thousands)                
Trade receivables   $ 2,397     $ 1,377  
Other     1,500       1,699  
Total     3,897       3,076  
Less: allowance for doubtful accounts     (25 )     (25 )
Net accounts receivable   $ 3,872     $ 3,051