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Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |
Impairment of equity securities | $ 703 | $ 2,346 | $ 6,593 |
Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 3,386 |  | $ 3,107
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1,179) |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 559 |  | 1,381
Available-for-sale Securities, Estimated Fair Value | $ 4,488 | 2,766 |  |
Paramount Gold Nevada Corp. [Member] | Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 1,470 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1,036) |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |  |
Available-for-sale Securities, Estimated Fair Value |  | 434 |  |
Northair Silver Corp. [Member] | Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 725 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 9 |  |
Available-for-sale Securities, Estimated Fair Value |  | 734 |  |
Agnico- Eagle Mines Ltd. [Member] | Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 420 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 518 |  |
Available-for-sale Securities, Estimated Fair Value |  | 938 |  |
Kootenay Silver, Inc. [Member] | Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  |  |  | 2,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | 0
Available-for-sale Securities, Estimated Fair Value |  |  |  | 2,645
Silver Bull Resources, Inc. [Member] | Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 305 |  | 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 |  | 0 |  | 783
Available-for-sale Securities, Estimated Fair Value |  | 305 |  | 1,016
Other Investments [Member] | Equity Securities [Member] |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 466 |  | 229
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (143) |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 32 |  | 598
Available-for-sale Securities, Estimated Fair Value |  | $ 355 |  | $ 827

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