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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Held-to-maturity Securities, Restricted | $ 17,700 |  | $ 17,700 |  | $ 11,600
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |
Impairment of equity securities | 0 | $ 483 | 20 | $ 2,028 |
Equity Securities [Member] |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Cost | 3,789 |  | 3,789 |  | 3,386
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (51) |  | (51) |  | (1,179)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 2,470 |  | 2,470 |  | 559
Available-for-sale Securities, Estimated Fair Value | 6,208 |  | 6,208 |  | 2,766
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 | 51 |  | 51 |  |
Less than twelve Months, Fair Value | 7 |  | 7 |  |
Twelve months or more, Fair Value | 0 |  | 0 |  |
Fair Value | 7 |  | 7 |  |
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 | 3,366 |  | 3,366 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 1,295 |  | 1,295 |  |
Available-for-sale Securities, Estimated Fair Value | 4,661 |  | 4,661 |  |
Silver Bull Resources, Inc. [Member] | Equity Securities [Member] |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Cost | 232 |  | 232 |  | 305
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 | 1,175 |  | 1,175 |  | 0
Available-for-sale Securities, Estimated Fair Value | 1,407 |  | 1,407 |  | 305
Other Investments [Member] | Equity Securities [Member] |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Cost | 191 |  | 191 |  | 466
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (51) |  | (51) |  | (143)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 32
Available-for-sale Securities, Estimated Fair Value | $ 140 |  | $ 140 |  | $ 355

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