Investments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Investment in Marketable Securities (Textual) [Abstract]
Impairment of equity securities	$ 121	$ 0
Held-to-maturity Securities, Restricted	19,000		$ 17,600
Equity Securities [Member]
Available-for-sale Securities
Cost	3,005		3,107
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(64)		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	855		1,381
Available-for-sale Securities, Estimated Fair Value	3,796		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	(64)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	450
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	450
Kootenay Silver, Inc. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	2,167		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	0		0
Available-for-sale Securities, Estimated Fair Value	2,167		2,645
Rockhaven Resources Ltd [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	514
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(64)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0
Available-for-sale Securities, Estimated Fair Value	450
Silver Bull Resources, Inc. [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	131		233
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	356		783
Available-for-sale Securities, Estimated Fair Value	487		1,016
Other Investments [Member] \| Equity Securities [Member]
Available-for-sale Securities
Cost	193		229
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	499		598
Available-for-sale Securities, Estimated Fair Value	$ 692		$ 827

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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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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