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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]    
Adjusted Cost $ 74,017,000 $ 73,929,000
Unrealized Gain/(Loss) 2,927,000 1,544,000
Fair Value 76,944,000 75,473,000
Cash and Cash Equivalents 53,811,000 56,595,000
Current Marketable Securities 18,435,000 14,537,000
Investments 4,698,000 4,341,000
Fair Value, Inputs, Level 2 [Member] | Convertible Securities [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 1,023,000 1,023,000
Unrealized Gain/(Loss) 357,000
Fair Value 1,380,000 1,023,000
Cash and Cash Equivalents
Current Marketable Securities
Investments 1,380,000 1,023,000
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 3,318,000 3,318,000
Unrealized Gain/(Loss)
Fair Value 3,318,000 3,318,000
Cash and Cash Equivalents
Current Marketable Securities
Investments 3,318,000 3,318,000
Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 48,799,000 50,286,000
Unrealized Gain/(Loss)
Fair Value 48,799,000 50,286,000
Cash and Cash Equivalents 48,799,000 50,286,000
Current Marketable Securities
Investments
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 5,012,000 6,309,000
Unrealized Gain/(Loss)
Fair Value 5,012,000 6,309,000
Cash and Cash Equivalents 5,012,000 6,309,000
Current Marketable Securities
Investments
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 15,865,000 12,993,000
Unrealized Gain/(Loss) 2,570,000 1,544,000
Fair Value 18,435,000 14,537,000
Cash and Cash Equivalents
Current Marketable Securities 18,435,000 14,537,000
Investments