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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue, net – mineral property sale	$ 408
Costs, expenses and other:
Exploration expense	163	180
Depreciation	7	6
General and administrative	425	403
Total costs, expenses and other	595	589
Interest income (net)	72	26
Unrealized (loss) on marketable equity securities	(326)	(441)
Total other loss	(254)	(415)
Net loss	$ (441)	$ (1,004)
Basic and diluted	$ (0.01)	$ (0.02)
Weighted average shares outstanding:
Basic and diluted	58,158	58,444

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Exploration expense mineral properties.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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