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Investments in marketable securities.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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-Publisher FASB
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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-Publisher FASB
-Name Accounting Standards Codification
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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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The carrying amount of securities categorized as held-to-maturity which serve as security for borrowings or other arrangements.

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-Name Accounting Standards Codification
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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale Securities [Abstract]
Gain (Loss) on Investments	$ (2,493)	$ 203	$ 2,017	$ (1,268)
Marketable Securities, Realized Gain (Loss)	(5,535)	(203)	(5,202)	1,268
Unrealized gain (loss) on equity securities	(8,028)	$ 0		$ 0
Investment in Marketable Securities (Textual) [Abstract]
Held-to-maturity Securities, Restricted					$ 21,600	$ 20,800
Equity securities
Available-for-sale Securities
Cost	14,288		14,288			21,771
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1,257)		(1,257)			(881)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	4,546		4,546			7,355
Available-for-sale Securities	17,577		17,577			28,245
Debt Securities
Available-for-sale Securities
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(363)		(363)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	363		363
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,314		6,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,314		6,314
Equity and debt securities
Available-for-sale Securities
Cost	20,965		20,965			28,448
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1,707)		(1,707)			(966)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	4,546		4,546			7,355
Available-for-sale Securities	23,804		23,804			34,837
Metalla Royalty & Streaming Ltd. \| Equity securities
Available-for-sale Securities
Cost	6,294		6,294			6,294
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0			0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	2,228		2,228			1,354
Available-for-sale Securities	8,522		8,522			7,648
Metalla Royalty & Streaming Ltd. \| Debt Securities
Available-for-sale Securities
Cost	6,677		6,677			6,677
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(450)		(450)			(85)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0		0			0
Available-for-sale Securities						6,592
Corvus Gold Inc. [Member] \| Equity securities
Available-for-sale Securities
Cost						3,582
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax						0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax						4,518
Available-for-sale Securities						8,100
Almaden Minerals, Ltd. [Member] \| Equity securities
Available-for-sale Securities
Cost						3,125
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax						(235)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax						0
Available-for-sale Securities						2,890
Northern Empire Resources Corp. [Member] \| Equity securities
Available-for-sale Securities
Cost	4,489		4,489			4,489
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0			0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	2,298		2,298			1,077
Available-for-sale Securities	6,787		6,787			5,566
Rockhaven Resources, Ltd. [Member] \| Equity securities
Available-for-sale Securities
Cost	2,064		2,064			2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(623)		(623)			(193)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0		0			0
Available-for-sale Securities	1,441		1,441			1,871
Other Investments [Member] \| Equity securities
Available-for-sale Securities
Cost	1,441		1,441			1,479
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(634)		(634)			(453)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	20		20			405
Available-for-sale Securities	827		827			1,431
Kootenay Silver, Inc. [Member] \| Equity securities
Available-for-sale Securities
Cost						738
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax						0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax						1
Available-for-sale Securities						739
Level 3 \| Equity and debt securities
Available-for-sale Securities
Available-for-sale Securities						$ 6,891
Available-for-sale Securities \| Level 3 \| Equity and debt securities
Available-for-sale Securities
Available-for-sale Securities	$ 6,227		$ 6,227