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Consolidated Statements of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Operating activities:    
Net loss $ (2,064) $ (2,332)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (71) (118)
Depreciation and amortization 21 44
Loss on equity method investment 381  
Employee stock option expense 349 645
Asset write down   39
Deferred income tax expense (benefit) 93 (293)
Amortization of discount on long-term debt 114  
(Gain) on asset and equity security sales (1,870) (575)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (145) (26)
Accounts payable and other current liabilities (362) (479)
Net cash used in operating activities (3,554) (3,095)
Investing activities:    
Additions to mineral properties (1,680) (5)
Additions to other assets (50) (8)
Proceeds from sale of marketable equity securities 1,964 730
Proceeds from sale of other assets   22
Net cash provided by investing activities 234 739
Financing activities:    
Short-term borrowing 1,075 600
Repayment of short-term borrowing (1,926)  
Repayment of long-term debt (500)  
Proceeds from common stock offering, net 8,937  
Noncontrolling interest contribution 80 747
Proceeds on exercise of options 181  
Payment to noncontrolling investor (100)  
Net cash provided by financing activities 7,747 1,347
Net increase (decrease) in cash and cash equivalents 4,427 (1,009)
Cash and cash equivalents, beginning of period 478 1,946
Cash and cash equivalents, end of period 4,905 937
Supplemental disclosure of non-cash activities:    
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