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Business and Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]        
Interest income from SiverStream Note $ 3   $ 9  
Mineral property revenue 0 $ 0 408 $ 502
Fair value of the SilverStream Note 268   268  
Exchange gain and loss     1  
Cash and cash equivalents held in brokerage accounts and foreign banks 328   328  
Current assets in United States Treasury Securities $ 7,318   $ 7,318  
Potentially dilutive shares related to outstanding common stock options 4,373,000 4,025,228 4,373,000 4,025,228