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Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Short-term Investments	$ 2,077	$ 3,951
Marketable equity securities at fair value	1,051	949
Kinross Call Option	8	0
Level 1 [Member]
Short-term Investments	2,077	3,951
Marketable equity securities at fair value	1,051	949
Kinross Call Option	8
Level 2 [Member]
Short-term Investments	0	0
Marketable equity securities at fair value	0	0
Kinross Call Option	0
Level 3 [Member]
Short-term Investments	0	0
Marketable equity securities at fair value	0	$ 0
Kinross Call Option	$ 0

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- Definition

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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-Topic 942
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-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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