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Business and Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Interest income received from convertible note $ 3   $ 6  
Mineral property revenue recorded for royalty sale $ 502 408 $ 502
Fair value of cash received on date of sale     185  
Fair value of note received for royalty sale less carrying value     263  
Value of assets sold in royalty sale     40  
Approximate fair value of SilverStream note 267   267  
Charge to exchange gain/loss for royalty sale     4  
Cash and cash equivalents held in brokerage accounts and foreign banks 553   553  
Current assets in United States Treasury Securities $ 8,714   $ 8,714  
Potentially dilutive shares related to outstanding common stock options 4,373,000 4,025,228 4,373,000 4,025,228
Operating lease asset Wheat Ridge office $ 82   $ 82