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Employee Stock Compensation Plans (Details 1) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Number of options outstanding, beginning | 4,373,000 |  | 5,223,160 |
Number of options granted | 1,325,000 |  | 150,000 |
Number of options exercised | 0 |  | 0 |
Number of options expired | 0 |  | (1,000,160) |
Number of options forfeited | (140,000) |  | 0 |
Number of options outstanding, ending | 5,558,000 |  | 4,373,000 |
Number of options exercisable | 4,083,500 |  | 2,774,000 |
Weighted average exercise price outstanding, beginning | $ 0.58 |  | $ 0.76 |
Weighted average exercise price granted | .20 |  | 0.28 |
Weighted average exercise price exercised | .00 |  | 0.00 |
Weighted average exercise price expired | .00 |  | 1.47 |
Weighted average exercise price forfeited | .77 |  | 0.00 |
Weighted average exercise price outstanding, ending | .48 |  | 0.58 |
Weighted average exercise price exercisable | $ .57 |  | $ 0.63 |
Aggregate intrinsic value outstanding | $ 925,000 | [1] | $ 3,000 | [2]
Aggregate intrinsic value exercisable | $ 446,000 | [1] | $ 840 | [2]
[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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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