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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities:    
Net loss $ (607) $ (441)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 6 7
Amortization of right of use lease asset 10 10
Unrealized loss on marketable equity securities 233 326
Employee stock option expense 85 88
Gain on sale of marketable equity securities (25) 0
Loss on derivative instruments 25 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (21) 64
Note receivable, net of mineral property sold 0 (223)
Accounts payable and other current liabilities 56 (3)
Net cash used in operating activities (238) (172)
Investing activities:    
Sale of short-term investments, net 40 602
Cash from sale of marketable equity securities 76 0
Purchase (sale) of derivative instruments - net (9) 0
Net cash provided by investing activities 107 602
Financing activities:    
Purchase of common stock for cancellation (3) (9)
Net cash used in financing activities (3) (9)
Net increase (decrease) in cash and cash equivalents (134) 421
Cash and cash equivalents, beginning of period 574 117
Cash and cash equivalents, end of period $ 440 $ 538