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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) for the period $ (12,035) $ (3,133) $ 1,011
Adjustments to reconcile net income/(loss) for the period to net cash provided by/(used) in operations:      
Depreciation and amortization 655 618 694
Stock-based compensation 874 645 817
Gain on disposal of marketable securities     (12)
Gain on disposal of mineral property (358) (150) (1,958)
Write-down of value-added tax receivable     572
(Gain)/loss on other investments 1,248 (3,196) 1,593
Change in working capital account items:      
Other current assets (160) (88) 316
Provision for environmental liability (108) 350  
Accounts payable, accrued liabilities and other 1,083 (70) (24)
Net cash provided by/(used in) operating activities (8,801) (5,024) 3,009
Cash flows from investing activities:      
Proceeds from sales of marketable securities 6,831   41
Proceeds from sale of other investments, net     2,772
Disposition of short-term investments, net of acquisitions 6,831   41
Disposition of short-term investments, net of acquisitions   (9,985) (11,990)
Additions to plant and equipment   (37) (134)
Proceeds from option/sales agreements, net 1,761 150 3,490
Net cash provided by/(used in) investing activities 8,592 (9,872) (5,821)
Cash flows from financing activities:      
Proceeds from equity financings, net   15,883  
Payment of taxes from withheld shares (264)    
Proceeds from exercise of stock options   15  
Net cash provided by/(used in) financing activities (264) 15,898  
Net increase/(decrease) in cash and cash equivalents (473) 1,002 (2,812)
Cash and cash equivalents, beginning of period 1,904 902 3,714
Cash and cash equivalents, end of period $ 1,431 $ 1,904 $ 902