SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Accounts Payable and Accruals, Other) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts payable and accruals - other:
Payroll and related expenses	$ 1,386	$ 1,190
Interest payable	645	511
Provision for vacation	1,650	1,399
Accrued expenses	4,802	3,575
Royalties payable	301	226
Property and equipment suppliers	526	595
Accounts Payable, Current	$ 9,310	$ 7,496