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Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Assets
Marketable equity securities	$ 949,000	$ 1,307,000
Short-term investments	3,951,000	5,087,000
Vendetta warrants		3
Level 1
Assets
Marketable equity securities	949,000	1,307,000
Short-term investments	3,951,000	5,087,000
Vendetta warrants		0
Level 2
Assets
Marketable equity securities	0	0
Short-term investments	0	0
Vendetta warrants		3,000
Level 3
Assets
Marketable equity securities	0	0
Short-term investments	$ 0	0
Vendetta warrants		$ 0

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The fair value as of the balance sheet date of firm holdings in corporate stocks (common and preferred), stock options, warrants and any other financial instrument which represents, or provides the ability to obtain, ownership rights in a corporation. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Amount of investment in marketable security.

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

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