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Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities:    
Net income (loss) $ 9,356 $ (1,584)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (84) (39)
Depreciation and amortization $ 7 11
Loss on equity method investment 153
(Gain) loss on warrant liability $ (49) 142
Employee stock option expense 470 $ 622
Accrued income tax expense 997
Accrued interest income $ (3)
Property abandonment and impairment $ 20
Loss (gain) on equity security and asset sales $ 962 $ (473)
(Gain) on sale of discontinued operations (12,746)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (58) $ 60
Accounts payable and other current liabilities (105) (109)
Net cash (used in) operating activities from continuing operations (1,253) (1,197)
Net cash (used in) operating activities from discontinued operations (190) (60)
Net cash (used in) operating activities (1,443) (1,257)
Investing activities:    
Sale of derivative instruments 84 36
Proceeds from sale of marketable equity securities 809 $ 556
Proceeds from sale of MH-LLC 24,000
Other assets, net 1
Net cash provided by investing activities from continuing operations 24,894 $ 592
Net cash (used in) investing activities from discontinued operations (1,059) (1,588)
Net cash provided by (used in) investing activities $ 23,835 (996)
Financing activities:    
Proceeds from issuance of common stock 1,630
Short-term borrowing (net) (802)
(Repayment) proceeds from long-term debt $ (5,000) 1,500
Payment to noncontrolling interest (250)
Net cash (used) provided by financing activities $ (5,000) 2,078
Net increase (decrease) in cash and cash equivalents 17,392 (175)
Cash and cash equivalents, beginning of period 487 2,092
Cash and cash equivalents, end of period 17,879 1,917
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 228 154
Supplemental disclosure of non-cash activities:    
Capitalized non-cash interest 265 309
Capitalized depreciation 7 $ 20
Loan to non-controlling interest $ 191
Issuance of stock to noncontrolling interest $ 76
Issuance of stock for mineral property $ 51 38
Issuance of stock to settle severance liability $ 45