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Employee Stock Compensation Plans (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Options granted 150,000 4,023,000 [1]
2013 Plan | 1/24/19    
Option - grant date price [2] $ .28  
Options granted [2] 150,000  
Expected life years [2] 5 years  
Expected volatility [2] 64.00%  
Risk free interest rate [2] 2.40%  
Weighted average fair value [2] $ .16  
Grant date fair value [2] $ 23  
2013 Plan | 1/02/18    
Option - grant date price [3]   $ .62
Options granted [3]   100,000
Expected life years [3]   9 months 18 days
Expected volatility [3]   66.00%
Risk free interest rate [3]   1.00%
Weighted average fair value [3]   $ .12
Grant date fair value [3]   12
2013 Plan | 11/01/18    
Option - grant date price [4]   $ .31
Options granted [4]   1,623,000
Expected life years [4]   5 years
Expected volatility [4]   64.00%
Risk free interest rate [4]   3.00%
Weighted average fair value [4]   $ .17
Grant date fair value [4]   $ 282
[1] Options granted during 2018, include 2,300,000 Conditional Options (defined below), approved by Solitario shareholders on June 19, 2018.
[2] Option grants have a five-year term, and vest 25% on date of grant and 25% on each of the next three anniversary dates.
[3] Option granted to a consultant had an expected life of 0.8 years on grant date and was fully vested during 2018. Option remains vested for a maximum of five years from date of grant or termination of the consulting contract.
[4] 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.