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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Accounts Payable and Accruals, Other) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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