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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities:    
Net loss $ (2,700) $ (3,965)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on derivative instruments 76 122
Depreciation and amortization 42 34
Loss on equity method investment 339 494
Employee stock option expense 523 523
Property abandonment and impairment 24   
Warrant liability 729   
Deferred income tax expense (432) (476)
Amortization of discounts and deferred offering cost on long-term debt 187 165
Gain on asset and equity security sales (1,472) (1,870)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 272 (168)
Accounts payable and other current liabilities 277 110
Net cash used in operating activities (2,135) (5,031)
Investing activities:    
Additions to mineral properties (2,557) (1,730)
Additions to other assets (86) (116)
Proceeds from sale of mineral property 6,000   
Proceeds from sale of marketable equity securities 1,591 1,964
Sale of derivative instruments 68 57
Net cash provided by investing activities 5,016 175
Financing activities:    
Short-term borrowing 1,565 1,075
Repayment of short-term borrowing (3,171) (1,926)
Repayment of long-term debt (750) (500)
Proceeds from issuance of debt 1,500   
Deferred offering costs (588)   
Proceeds from sale of common stock, net 275 8,937
Non-controlling interest contribution 50 80
Proceeds from exercise of options    232
Payment to noncontrolling investor, net (169) (200)
Net cash provided by financing activities (1,288) 7,698
Net increase in cash and cash equivalents 1,593 2,842
Cash and cash equivalents, beginning of period 432 478
Cash and cash equivalents, end of period 2,025 3,320
Warrant liability 650   
Repayment of loan by noncontrolling interest, net 373   
Issuance of stock to noncontrolling interest 71   
Transfer of contra-noncontrolling interest to noncontrolling interest upon earn-in 531   
Disproportionate share entry from noncontrolling interest to additional paid-in capital upon earn-in 2,983   
Royalty sale receivable 4,000   
Reclassification of stock option liability to additional paid-in capital    1,240
Reclassification of stock option liability to accumulated deficit, net of deferred taxes of $543    $ 992