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Fair Value of Financial Instruments (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Assets
Marketable equity securities	$ 357,000	$ 1,322,000
Short-term investments	7,573,000	4,523,000
Level 1
Assets
Marketable equity securities	357,000	1,322,000
Short-term investments	7,573,000	4,523,000
Level 2
Assets
Marketable equity securities	0	0
Short-term investments	0	0
Level 3
Assets
Marketable equity securities	0	0
Short-term investments	$ 0	0
Kinross calls
Assets
Liabilities		67,000
Kinross calls | Level 1
Assets
Liabilities		67,000
Kinross calls | Level 2
Assets
Liabilities		0
Kinross calls | Level 3
Assets
Liabilities		$ 0

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