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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (352)	$ (1,443)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	13	13
Amortization of right of use lease asset	20	20
Unrealized gain (loss) on marketable equity securities	(251)	389
Employee stock option expense	215	173
Gain on sale of marketable equity securities	(25)	0
Other income - gain on conversion of SilverStream Note	(44)	0
Loss on derivative instruments	20	0
Changes in operating assets and liabilities:
Prepaid expenses and other assets	8	114
Note receivable, net of mineral property sold	0	(223)
Accounts payable and other current liabilities	(125)	(38)
Net cash used in operating activities	(521)	(995)
Investing activities:
Sale of short-term investments, net	162	1,453
Cash from sale of marketable equity securities	76	0
Purchase (sale) of derivative instruments - net	14	0
Net cash provided by investing activities	252	1,453
Financing activities:
Paycheck Protection Loan	70	0
Purchase of common stock for cancellation	(4)	(11)
Net cash used in financing activities	66	(11)
Net increase (decrease) in cash and cash equivalents	(203)	447
Cash and cash equivalents, beginning of period	574	117
Cash and cash equivalents, end of period	371	564
Conversion of SilverStream note to Marketable equity securities	$ 294	$ 0

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of noncash expense for option under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration