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Marketable Equity Securities (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Marketable Equity Securities
Cost of marketable equity securities sold	$ 264,000	$ 395,000
Realized (loss) gain on marketable equity securities sold	(201,000)	(248,000)
Proceeds from the sale of marketable equity securities sold	63,000	147,000
Net (loss) gain on marketable equity securities	(295,000)	(166,000)
Additions to marketable equity securities	0	0
Change in marketable equity securities at fair value	$ (358,000)	$ (313,000)

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Amount of unrealized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).

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Amount of cash outflow (inflow) through acquisition (sale) of short-term available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3098-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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