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Business and Significant Accounting Policies (Details Narrative) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Business and Significant Accounting Policies    
Cash And Cash Equivalents Held In Brokerage Accounts And Foreign Banks $ 425,000  
Maturities Period Of Current Assets In United States Treasury Securities 30 days to 11 months  
Current Assets In United States Treasury Securities $ 3,163,000  
Potentially Dilutive Shares Related To Outstanding Common Stock Options 5,390,000 5,440,000