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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities:    
Net loss $ (530) $ (651)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (285) (132)
Depreciation and amortization 2 3
Deferred income taxes (89) (237)
Accrued interest income (13)
Gain on warrant liability (4)
Gain on equity security and asset sales (net) (221) (16)
Property abandonment and impairment 10
Employee stock option expense 31
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (36) 25
Accounts payable and other current liabilities 119 (29)
Net cash used in operating activities (1,053) (1,000)
Investing activities:    
Sale (purchase) of short-term investments, net 2,496 (16,007)
Loan to Zazu (1,500)
Additions to mineral properties (40)
Purchase of marketable equity securities (167) (304)
Proceeds from sale of marketable equity securities 259 40
Sale of derivative instruments 43 45
Net cash provided by (used in) investing activities 1,131 (16,266)
Financing activities:    
Purchase of common stock for cancellation (28) (201)
Net cash provided by financing activities (28) (201)
Net increase (decrease) in cash and cash equivalents 50 (17,467)
Cash and cash equivalents, beginning of period 119 17,718
Cash and cash equivalents, end of period $ 169 $ 251