The following table summarizes the changes in investments in other equity securities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the nine months ended September 30, 2022: (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of financial instruments	$ 3,000	$ (259,000)	$ 27,000	$ 130,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at January 1, 2022			9,215,000
Investment in preferred stock			6,495,000
Change in fair value of financial instruments			25,850,000
Conversion to marketable securities			(37,644,000)
Balance at September 30, 2022	$ 3,916,000		$ 3,916,000