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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
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

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