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

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Investments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment in Marketable Securities (Textual) [Abstract]
Impairment of equity securities	$ 703	$ 426	$ 700	$ 2,346
Held-to-maturity Securities, Restricted		20,800	17,600
Equity securities
Available-for-sale Securities
Cost		21,771	3,107
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(881)	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		7,355	1,381
Available-for-sale Securities		28,245	4,488
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		881
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		5,662
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		5,662
Debt Securities
Available-for-sale Securities
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(85)
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		85
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		6,592
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		6,592
Equity and debt securities
Available-for-sale Securities
Cost		28,448
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(966)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		7,355
Available-for-sale Securities		34,837
Metalla Royalty & Streaming Ltd. \| Equity securities
Available-for-sale Securities
Cost		6,294
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		1,354
Available-for-sale Securities		7,648
Metalla Royalty & Streaming Ltd. \| Debt Securities
Available-for-sale Securities
Cost		6,677
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(85)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		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
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		1,077
Available-for-sale Securities		5,566
Rockhaven Resources, Ltd. [Member] \| Equity securities
Available-for-sale Securities
Cost		2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(193)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		0
Available-for-sale Securities		1,871
Kootenay Silver, Inc. [Member] \| Equity securities
Available-for-sale Securities
Cost		738	2,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		1	0
Available-for-sale Securities		739	2,645
Silver Bull Resources, Inc. [Member] \| Equity securities
Available-for-sale Securities
Cost			233
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax			783
Available-for-sale Securities			1,016
Other Investments [Member] \| Equity securities
Available-for-sale Securities
Cost		1,479	229
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(453)	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		405	598
Available-for-sale Securities		$ 1,431	$ 827