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Note A - The Company and Summary of Significant Accounting Policies - Summary of Accounts Receivable (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Accounts receivable | $ 3,985,988 |  | $ 2,096,569 | $ 1,234,411
Accounts Receivable, Allowance for Credit Loss, Current | 573,785 | $ 213,785 | 213,785 | 1,733,785
Allowance for doubtful accounts, charged to costs and expenses | (50,000) | (0) | (360,000) | (200,000)
Loss on foreign currency transactions | (15,000) | $ 0 | 0 | (50,000)
Accounts Receivable, Credit Loss Expense (Reversal) |  |  | 0 | (1,720,000)
Accounts Receivable, Allowance for Credit Loss, Current | 623,785 |  | 573,785 | 213,785
Allowance for doubtful accounts | (623,785) |  | (573,785) | (213,785)
Accounts receivable, net of allowances for doubtful accounts | $ 3,362,203 |  | $ 1,522,784 | $ 970,626

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