Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Adjusted Cost	$ 62,922,000	$ 73,929,000
Adjusted Cost	67,285,000	73,929,000
Unrealized Gain/(Loss)	3,042,000	1,544,000
Fair Value	70,327,000	75,473,000
Cash and Cash Equivalents	43,945,000	56,595,000
Restricted cash
Marketable Securities	17,224,000	14,537,000
Notes receivable
Investments	9,158,000	4,341,000
Fair Value, Inputs, Level 2 [Member] \| Convertible Securities [Member]
Cash and Cash Equivalents [Line Items]
Adjusted Cost		1,023,000
Adjusted Cost	1,023,000	1,023,000
Unrealized Gain/(Loss)	1,135,000
Fair Value	2,158,000	1,023,000
Cash and Cash Equivalents
Restricted cash
Marketable Securities
Notes receivable
Investments	2,158,000	1,023,000
Fair Value, Inputs, Level 2 [Member] \| Warrant [Member]
Cash and Cash Equivalents [Line Items]
Adjusted Cost		3,318,000
Adjusted Cost	3,318,000	3,318,000
Unrealized Gain/(Loss)	3,682,000
Fair Value	7,000,000	3,318,000
Cash and Cash Equivalents
Restricted cash
Marketable Securities
Notes receivable
Investments	7,000,000	3,318,000
Cash [Member]
Cash and Cash Equivalents [Line Items]
Adjusted Cost	40,811,000	50,286,000
Adjusted Cost	40,811,000	50,286,000
Unrealized Gain/(Loss)
Fair Value	40,811,000	50,286,000
Cash and Cash Equivalents	40,811,000	50,286,000
Restricted cash
Marketable Securities
Notes receivable
Investments
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents [Line Items]
Adjusted Cost	3,134,000	6,309,000
Adjusted Cost	3,134,000	6,309,000
Unrealized Gain/(Loss)
Fair Value	3,134,000	6,309,000
Cash and Cash Equivalents	3,134,000	6,309,000
Restricted cash
Marketable Securities
Notes receivable
Investments
Marketable Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents [Line Items]
Adjusted Cost	18,977,000	12,993,000
Adjusted Cost	18,999,000	12,993,000
Unrealized Gain/(Loss)	(1,775,000)	1,544,000
Fair Value	17,224,000	14,537,000
Cash and Cash Equivalents
Restricted cash
Marketable Securities	17,224,000	14,537,000
Notes receivable
Investments

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