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TRADE AND OTHER RECEIVABLES (Schedule of Trade and Other Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Trade and other current receivables [abstract]    
Trade receivables, net of impairment losses $ 17,754 $ 21,318
Prepayments 576 807
Contract assets 2,317 1,894
Value added tax 59 63
Finance lease receivables 281 359
Total and other receivables $ 20,987 $ 24,441