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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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		6 Months Ended
Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investment in Marketable Securities (Textual) [Abstract]
Impairment of equity securities	$ 305	$ 20	$ 426	$ 20
Held-to-maturity Securities, Restricted	19,300		19,300		$ 17,600
Equity Securities [Member]
Available-for-sale Securities
Cost	10,997		10,997		3,107
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(242)		(242)		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	1,117		1,117		1,381
Available-for-sale Securities, Estimated Fair Value	11,872		11,872		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	(242)		(242)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,083		2,083
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	2,083		2,083
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	461		461
Available-for-sale Securities, Estimated Fair Value	3,586		3,586
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	41		41
Available-for-sale Securities, Estimated Fair Value	3,040		3,040
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	(197)		(197)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0		0
Available-for-sale Securities, Estimated Fair Value	1,867		1,867
Kootenay Silver, Inc. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	1,291		1,291		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	0		0		0
Available-for-sale Securities, Estimated Fair Value	1,291		1,291		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, Estimated Fair Value					1,016
Other Investments [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	1,518		1,518		229
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(45)		(45)		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	615		615		598
Available-for-sale Securities, Estimated Fair Value	$ 2,088		$ 2,088		$ 827