Employee Stock Compensation Plans	6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Employee Stock Compensation Plans	9. 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 June 30, 2019, and December 31, 2018 there were options outstanding that are exercisable to acquire 4,373,000 and 5,223,160 shares, respectively, of Solitario common stock, with option prices between $0.28 and $0.77 per share. During the three months ended June 30, 2019 and 2018 Solitario did not grant any additional options. During the six months ended June 30, 2019, Solitario granted options exercisable to acquire 150,000 shares of common stock, with an exercise price of $0.28 per share, a five-year term, and a grant date fair value of $23,000 based upon a Black-Scholes model, with a 64% volatility and a 2.4% risk-free interest rate. In addition, during the six months ended June 30, 2019, options exercisable to acquire 1,000,160 shares of common stock, with exercise prices between $1.68 and $0.70 per share, expired unexercised. During the six months ended June 30, 2018, Solitario granted options exercisable to acquire 100,000 shares of common stock to a consultant, with an exercise price of $0.62 per share, a seven-month term and a grant date fair value of $12,000 based upon a Black-Scholes model with a 66% volatility and a 1% risk-free interest rate. There were no exercises of options under the 2013 Plan during the three and six months ended June 30, 2019 and 2018. During the three and six months ended June 30, 2019, Solitario recorded stock option compensation expense of $85,000 and $173,000, respectively. During the three and six months ended June 30, 2018, Solitario recorded non-cash stock option compensation expense of $432,000 and $442,000, respectively. On September 1, 2017, the Board of Directors granted, subject to shareholder approval at the next meeting of shareholders, 2,300,000 stock options under the 2013 Plan to officers and members of the Board of Directors (the “Conditional Options”). The Conditional Options were approved at Solitario’s annual meeting on June 19, 2018. The Conditional Options have a five-year life, an exercise price of $0.77 per share, and a grant date fair value of $970,000, based upon a Black-Scholes model with a volatility of 64%, and a risk-free interest rate of 1.70%. The Conditional Options vest on the schedule of 25% on date of approval of the grant (June 19, 2018) and 25% on each of the next three anniversary dates of the date of grant (September 1, 2018, 2019 and 2020). At June 30, 2019, the total unrecognized stock option compensation cost related to non-vested options is $487,000 and is expected to be recognized over a weighted average period of 19 months.

Employee Stock Compensation Plans

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

9. 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 June 30, 2019, and December 31, 2018 there were options outstanding that are exercisable to acquire 4,373,000 and 5,223,160 shares, respectively, of Solitario common stock, with option prices between $0.28 and $0.77 per share. During the three months ended June 30, 2019 and 2018 Solitario did not grant any additional options. During the six months ended June 30, 2019, Solitario granted options exercisable to acquire 150,000 shares of common stock, with an exercise price of $0.28 per share, a five-year term, and a grant date fair value of $23,000 based upon a Black-Scholes model, with a 64% volatility and a 2.4% risk-free interest rate. In addition, during the six months ended June 30, 2019, options exercisable to acquire 1,000,160 shares of common stock, with exercise prices between $1.68 and $0.70 per share, expired unexercised. During the six months ended June 30, 2018, Solitario granted options exercisable to acquire 100,000 shares of common stock to a consultant, with an exercise price of $0.62 per share, a seven-month term and a grant date fair value of $12,000 based upon a Black-Scholes model with a 66% volatility and a 1% risk-free interest rate. There were no exercises of options under the 2013 Plan during the three and six months ended June 30, 2019 and 2018. During the three and six months ended June 30, 2019, Solitario recorded stock option compensation expense of $85,000 and $173,000, respectively. During the three and six months ended June 30, 2018, Solitario recorded non-cash stock option compensation expense of $432,000 and $442,000, respectively.

On September 1, 2017, the Board of Directors granted, subject to shareholder approval at the next meeting of shareholders, 2,300,000 stock options under the 2013 Plan to officers and members of the Board of Directors (the “Conditional Options”). The Conditional Options were approved at Solitario’s annual meeting on June 19, 2018. The Conditional Options have a five-year life, an exercise price of $0.77 per share, and a grant date fair value of $970,000, based upon a Black-Scholes model with a volatility of 64%, and a risk-free interest rate of 1.70%. The Conditional Options vest on the schedule of 25% on date of approval of the grant (June 19, 2018) and 25% on each of the next three anniversary dates of the date of grant (September 1, 2018, 2019 and 2020).

At June 30, 2019, the total unrecognized stock option compensation cost related to non-vested options is $487,000 and is expected to be recognized over a weighted average period of 19 months.