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Business and Summary of Significant Accounting Policies (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business and Summary of Significant Accounting Policies
Joint Venture Partner	50.00%
Cash And Cash Equivalents Held In Brokerage Accounts And Foreign Banks	$ 293,000
Maturities Period Of Current Assets In United States Treasury Securities	15 days to one year
Certificates Of Deposit, Face Value	$ 250,000	$ 100,000
Certificates Of Deposit, Fair Value	$ 3,951,000	$ 4,236,000
Potentially Dilutive Shares Related To Outstanding Common Stock Options	5,390,000	5,513,000
Maturity of short term investment	maturities of three months to one year, which are recorded at their fair value of $851,000
Changes in interest rates on held securities	$ 108,000	$ 102,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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Total interest expense on long-term debt and capital securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.8)
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