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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Change in Accounting Principle - Other Income Related to the Sale of Exploration Properties (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Accounting Principle
Accumulated Deficit			$ (516,780,000)	$ (511,391,000)
Gain on sale of assets			3,144,000	5,144,000
Trading securities		$ 238,000			$ 238,000
Available for sale equity unrealized losses					$ 40,000
Retained earnings and other comprehensive income adjustment				(40,000)
Trading securities gain				51,000
ASU 2017-11 Earnings Per Share
Change in Accounting Principle
Accumulated Deficit			3,000	8,000
Sale, not discontinued operations \| Zacatecas
Change in Accounting Principle
Total consideration			1,500,000
Gain on sale of assets		$ 49,000		$ 748,000
Sale, not discontinued operations \| Zacatecas \| ASU 2014-09 Revenue from Contracts with Customers
Change in Accounting Principle
Gain on sale of assets	$ 49,000
Sale, not discontinued operations \| Cumulative Effect Adjustment \| Zacatecas \| ASU 2014-09 Revenue from Contracts with Customers
Change in Accounting Principle
Accumulated Deficit			$ (49,000)