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	3 Months Ended		9 Months Ended
Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Available-for-sale Securities
Cost	$ 27,151		$ 27,151
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(471)		(471)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	2,445		2,445
Available-for-sale Securities	29,125		29,125
Investment in Marketable Securities (Textual) [Abstract]
Impairment of equity securities	0	$ 0	426	$ 20
Held-to-maturity Securities, Restricted	21,000		21,000		$ 17,600
Equity Securities [Member]
Available-for-sale Securities
Cost	20,474		20,474		3,107
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(446)		(446)		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	2,445		2,445		1,381
Available-for-sale Securities	22,473		22,473		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	446		446
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,046		2,046
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	2,046		2,046
Debt Securities [Member]
Available-for-sale Securities
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(25)		(25)
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	25		25
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,652		6,652
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	6,652		6,652
Metalla Royalty & Streaming Ltd. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	6,294		6,294
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	817		817
Available-for-sale Securities	7,111		7,111
Metalla Royalty & Streaming Ltd. [Member] \| Debt Securities [Member]
Available-for-sale Securities
Cost	6,677		6,677
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(25)		(25)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0		0
Available-for-sale Securities	6,652		6,652
Corvus Gold Inc. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	3,582		3,582
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	542		542
Available-for-sale Securities	4,124		4,124
Almaden Minerals, Ltd. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	3,125		3,125
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	102		102
Available-for-sale Securities	3,227		3,227
Northern Empire Resources Corp. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	2,999		2,999
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	378		378
Available-for-sale Securities	3,377		3,377
Rockhaven Resources, Ltd. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	2,064		2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(364)		(364)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0		0
Available-for-sale Securities	1,700		1,700
Kootenay Silver, Inc. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	928		928		2,645
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	40		40		0
Available-for-sale Securities	968		968		2,645
Silver Bull Resources, Inc. [Member] \| Equity Securities [Member]
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 [Member]
Available-for-sale Securities
Cost	1,482		1,482		229
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(82)		(82)		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	566		566		598
Available-for-sale Securities	$ 1,966		$ 1,966		$ 827