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Marketable Equity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Marketable equity securities at fair value $ 1,307 $ 1,620
Vox Royalty Corp. [Member]    
Marketable equity securities at fair value $ 370  
Shares 134,055  
Vendetta Mining Corp. [Member]    
Marketable equity securities at fair value $ 356  
Shares 9,000,000  
Kinross Gold Corp    
Marketable equity securities at fair value $ 581  
Shares 100,000