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Derivative Instruments (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Fair value covered calls against holdings of Kinross common stock dec 2016 | $ 0 | $ 2

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Namespace Prefix: | XPL_
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Balance Type: | debit
Period Type: | duration

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Namespace Prefix: | us-gaap_
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Period Type: | duration