Employee Stock Compensation Plans	3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Employee Stock Compensation Plans	On June 18, 2013, Solitario’s shareholders approved the 2013 Solitario Exploration & Royalty Corp. Omnibus Stock and Incentive Plan (the “2013 Plan”). Under the terms of the 2013 Plan, a total of 1,750,000 shares of Solitario common stock were reserved for awards to directors, officers, employees and consultants. On June 29, 2017, Solitario shareholders approved an amendment to the 2013 Plan, which increased the number of shares of common stock available for issuance under the 2013 Plan from 1,750,000 to 5,750,000. Awards granted under the 2013 Plan may take the form of stock options, stock appreciation rights, restricted stock, and restricted stock units. The terms and conditions of the awards are pursuant to the 2013 Plan and are granted by the Board of Directors or a committee appointed by the Board of Directors. As of March 31, 2021, and December 31, 2020 there were options outstanding that are exercisable to acquire 5,347,650 and 5,558,000, respectively, shares of Solitario common stock, with exercise prices between $0.28 and $0.77 per share. During the three months ended March 31, 2021 and 2020, Solitario did not grant any options. During the three months ended March 31, 2021, options for 120,350 shares were exercised with an average exercise price of $0.56 per share for proceeds of $67,000. There were no exercises of options under the 2013 Plan during the three months ended March 31, 2020. During the three months ended March 31, 2021 and 2020, Solitario recorded stock option compensation expense of $28,000 and $85,000, respectively. At March 31, 2021, the total unrecognized stock option compensation cost related to non-vested options is $118,000 and is expected to be recognized over a weighted average period of 18 months.

Employee Stock Compensation Plans

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

On June 18, 2013, Solitario’s shareholders approved the 2013 Solitario Exploration & Royalty Corp. Omnibus Stock and Incentive Plan (the “2013 Plan”). Under the terms of the 2013 Plan, a total of 1,750,000 shares of Solitario common stock were reserved for awards to directors, officers, employees and consultants. On June 29, 2017, Solitario shareholders approved an amendment to the 2013 Plan, which increased the number of shares of common stock available for issuance under the 2013 Plan from 1,750,000 to 5,750,000. Awards granted under the 2013 Plan may take the form of stock options, stock appreciation rights, restricted stock, and restricted stock units. The terms and conditions of the awards are pursuant to the 2013 Plan and are granted by the Board of Directors or a committee appointed by the Board of Directors.

As of March 31, 2021, and December 31, 2020 there were options outstanding that are exercisable to acquire 5,347,650 and 5,558,000, respectively, shares of Solitario common stock, with exercise prices between $0.28 and $0.77 per share. During the three months ended March 31, 2021 and 2020, Solitario did not grant any options. During the three months ended March 31, 2021, options for 120,350 shares were exercised with an average exercise price of $0.56 per share for proceeds of $67,000. There were no exercises of options under the 2013 Plan during the three months ended March 31, 2020. During the three months ended March 31, 2021 and 2020, Solitario recorded stock option compensation expense of $28,000 and $85,000, respectively. At March 31, 2021, the total unrecognized stock option compensation cost related to non-vested options is $118,000 and is expected to be recognized over a weighted average period of 18 months.