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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Accounts Payable and Accruals, Other) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts payable and accruals - other: |  |
Payroll and related expenses | $ 1,460 | $ 1,381
Interest payable | 555 | 555
Provision for vacation | 1,526 | 1,754
Accrued expenses | 9,586 | 7,360
Royalties payable | 482 | 757
Property and equipment suppliers | 317 | 98
Accounts Payable, Current | $ 13,926 | $ 11,905

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