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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Accounts Payable and Accruals, Other) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts payable and accruals - other:    
Payroll and related expenses $ 1,099 $ 1,386
Interest payable 555 645
Provision for vacation 1,658 1,650
Accrued expenses 6,368 4,802
Royalties payable 369 301
Property and equipment suppliers 225 526
Accounts Payable, Current $ 10,274 $ 9,310