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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net loss $ (535) $ (994)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (32) (3)
Depreciation and amortization 3 7
Loss on equity method investment 125 313
Loss (gain) on warrant liability 260 (99)
Employee stock option expense 56 125
Deferred income tax benefit (100) (169)
Property abandonment and impairment    10
Gain on equity security sales (300)   
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 69 (14)
Accounts payable and other current liabilities (34) 33
Net cash used in operating activities (488) (791)
Investing activities:    
Additions to mineral properties (535) (362)
Sale of derivative instruments 36   
Proceeds from mineral property sale receivable    4,000
Proceeds from sale of marketable equity securities 350   
Other assets, net 11   
Net cash (used in) provided by investing activities (138) 3,638
Financing activities:    
Proceeds from issuance of common stock 1,630   
Short-term borrowing (net) (802)   
Proceeds from exercise of options    183
Proceeds from long-term debt    1,000
Payment to noncontrolling interest (250) (250)
Net cash provided by financing activities 578 933
Cash and cash equivalents, beginning of period 2,092 616
Cash and cash equivalents, end of period 2,044 4,396
Cash paid for interest, capitalized to mineral property 50,000 35,000
Capitalized non-cash interest 103,000 145,000
Issuance of stock to noncontrolling interest 75,000 77,000
Issuance of stock to settle severance liability $ 45,000