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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, 2022
Dec. 31, 2021
Accounts receivable $ 2,096,569 $ 1,234,411
Accounts Receivable, Allowance for Credit Loss, Current 213,785 1,733,785
Allowance for doubtful accounts, charged to costs and expenses (360,000) (200,000)
Loss on foreign currency transactions 0 (50,000)
Accounts Receivable, Credit Loss Expense (Reversal) 0 (1,720,000)
Accounts Receivable, Allowance for Credit Loss, Current 573,785 213,785
Allowance for doubtful accounts (573,785) (213,785)
Accounts receivable, net of allowances for doubtful accounts $ 1,522,784 $ 970,626