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Note A - The Company and Summary of Significant Accounting Policies - Share-based Compensation Expenses for Continuing Operations (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Share-based compensation expense | $ 265,732 | $ 387,907
Selling, General and Administrative Expenses [Member] |  |
Share-based compensation expense | 209,134 | 310,017
Research and Development Expense [Member] |  |
Share-based compensation expense | $ 56,598 | $ 77,890

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