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Schedule of Fair Value of Financial Instruments (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | $ 14,328,000 | $ 1,639,000
Marketable equity securities | 214,000 |
Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | 214,000 |
Marketable equity securities | 214,000 |
Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | 14,114,000 | 1,639,000
Marketable equity securities |  |
Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities |  |
Marketable equity securities |  |
U.S. Government Obligations [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | 323,000 | 1,014,000
U.S. Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities |  |
U.S. Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | 323,000 | 1,014,000
U.S. Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities |  |
Corporate Obligations [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | 13,791,000 | 625,000
Corporate Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities |  |
Corporate Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities | 13,791,000 | 625,000
Corporate Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Fair value of marketable debt securities |  |

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