The following table summarizes the changes in investments in equity securities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the year ended December 31, 2021: (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of warrants	$ 542,000	$ 49,000
Conversion of loans to equity securities	4,250,000
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, 2021	262,000
Investment in convertible preferred stock	14,950,000
Investment in warrants	2,673,000
Change in fair value of warrants	8,224,000
Conversion of loans to equity securities	3,520,000
Unrealized gains on equity securities	2,510,000
Conversion to marketable securities	(1,657,000)
Balance at December 31, 2021	$ 30,482,000	$ 262,000