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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income/(loss) for the period $ (3,133) $ 1,011 $ (18,926)
Adjustments to reconcile net income/(loss) for the period to net provided by/(cash used) in operations:      
Depreciation and amortization 618 694 863
Stock-based compensation 645 817 1,126
Gain on disposal of marketable securities   (12) (24)
Write-down of marketable securities and long-term investments     138
Gain on disposal of mineral property (150) (1,958)  
Write-down of value-added tax receivable   572  
Write-down of non-current assets     5,563
(Gain)/loss on other investments (3,196) 1,593 4,112
Other non-cash items     (162)
Change in working capital account items:      
Other current assets (88) 316 492
Provision for environmental liability 350    
Accounts payable, accrued liabilities and other (70) (24) (240)
Net cash provided by/(used in) operating activities (5,024) 3,009 (7,058)
Cash flows from investing activities:      
Proceeds from sales of marketable securities   41 60
Proceeds from sale of other investments, net   2,772 10,560
Acquisition of short-term investments, net of dispositions (9,985) (11,990)  
Additions to plant and equipment (37) (134) (7)
Proceeds from option/sales agreements, net 150 3,490 1,028
Net cash provided by/(used) in investing activities (9,872) (5,821) 11,641
Cash flows from financing activities:      
Proceeds from equity financings, net 15,883    
Repayment of debt     (6,344)
Proceeds from exercise of stock options 15    
Net cash provided by/(used in) financing activities 15,898   (6,344)
Increase/(decrease) in cash and cash equivalents 1,002 (2,812) (1,761)
Cash and cash equivalents, beginning of period 902 3,714 5,475
Cash and cash equivalents, end of period $ 1,904 $ 902 $ 3,714