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Other Investments - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Investments
Proceeds from Sale and Maturity of Marketable Securities	$ 413	$ 170
Fair value at beginning of period	5,462	3,746
Unrealized gain/(loss)	(1,643)	1,716
Fair value at end of period	$ 3,676	$ 5,462
Midas Gold Shares [Member]
Other Investments
Shares owned	6,882,115	7,802,615
Marketable Securities Cumulative Gain (Loss)	$ 1,975	$ 1,973
Number Marketable Securities Sold	920,500
Proceeds from Sale and Maturity of Marketable Securities	$ 413
Marketable Securities, Realized Gain (Loss)	(2)
Realized change	(415)
Unrealized gain/(loss)	$ 230
Nusantara Resources
Other Investments
Shares owned	1,333,334
Realized change	$ 272
Midas Gold And Nusantara Resources [Member]
Other Investments
Unrealized gain/(loss)	$ 1,413

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