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Employee Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock option grant assumptions |
Grant Date |  | 4/2/20 (1) |  |  | 1/24/19 (1) |
Option – grant date price |  | $ | 0.20 |  |  | $ | 0.28 |
Options granted |  |  | 1,325,000 |  |  |  | 150,000 |
Expected life years |  |  | 5.0 |  |  |  | 5.0 |
Expected volatility |  |  | 67 | % |  |  | 64 | %
Risk free interest rate |  |  | 0.4 | % |  |  | 2.4 | %
Weighted average fair value |  | $ | 0.11 |  |  | $ | 0.16 |
Grant date fair value |  | $ | 145,000 |  |  | $ | 23,000 |
(1) | Option grants have a five-year term, and vest 25% on date of grant and 25% on each of the next three anniversary dates.
Stock option activity |
|  | 2020 |  |  | 2019 |
|  |  |  |  | Weighted |  |  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Average |  |  | Aggregate |  |  |  |  |  | Average |  |  | Aggregate |
|  | RSUs/ |  |  | Exercise |  |  | Intrinsic |  |  | RSUs/ |  |  | Exercise |  |  | Intrinsic |
|  | Options |  |  | Price |  |  | Value (1) |  |  | Options |  |  | Price |  |  | Value (2) |
Outstanding, beginning of year |  |  | 4,373,000 |  |  | $ | 0.58 |  |  |  |  |  |  |  | 5,223,160 |  |  | $ | 0.76 |  |  |  |  |
Granted |  |  | 1,325,000 |  |  | $ | 0.20 |  |  |  |  |  |  |  | 150,000 |  |  | $ | 0.28 |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  | - |  |  |  |  |
Expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  | (1,000,160 | ) |  | $ | 1.47 |  |  |  |  |
Forfeited |  |  | (140,000 | ) |  | $ | 0.77 |  |  |  |  |  |  |  | - |  |  |  | - |  |  |  |  |
Outstanding, end of year |  |  | 5,558,000 |  |  | $ | 0.48 |  |  | $ | 925,000 |  |  |  | 4,373,000 |  |  | $ | 0.58 |  |  | $ | 3,000 |
Exercisable, end of year |  |  | 4,083,500 |  |  | $ | 0.57 |  |  | $ | 446,000 |  |  |  | 2,774,000 |  |  | $ | 0.63 |  |  | $ | 840 |
(1) Intrinsic value based upon December 31, 2020 price of a share of Solitario common stock as quoted on the NYSE American exchange of $0.56 per share. (2) Intrinsic value based upon December 31, 2019 price of a share of Solitario common stock as quoted on the NYSE American exchange of $0.30 per share.

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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