Equity Securities at Fair Value (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 3,717,000		$ 3,717,000		$ 2,710,000
Change in fair value of equity securities	(147,000)	$ (778,000)	(68,000)	$ (1,366,000)
Proceeds from sale of equity securities	$ 0	$ 0	$ 0	$ 0

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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-Publisher FASB
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