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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