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Note A - The Company and Summary of Significant Accounting Policies - Summary of Accounts Receivable (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Accounts receivable | $ 2,207,311 | $ 2,096,569 |  |  |
Allowance for doubtful accounts | (1,005,785) | (573,785) |  |  |
Accounts receivable, net | 1,201,526 | 1,522,784 | $ 1,499,218 | $ 2,078,785 | $ 2,462,203
Balance | 573,785 | 213,785 |  |  |
Charged to costs and expenses | 750,000 | 360,000 |  |  |
Deductions from reserves | (318,000) | 0 |  |  |
Balance | $ 1,005,785 | $ 573,785 |  |  |

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