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Note A - The Company and Summary of Significant Accounting Policies - Summary of Accounts Receivable (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Accounts receivable - current $ 561,834 $ 139,785
Accounts receivable - non current 1,720,000 1,720,000
Accounts Receivable, before Allowance for Credit Loss 2,281,834 1,859,785
Allowance for doubtful accounts - current (13,785) (13,785)
Allowance for doubtful accounts - non current (1,720,000) (1,720,000)
Accounts Receivable, Allowance for Credit Loss, Ending Balance (1,733,785) (1,733,785)
Accounts receivable, net of allowances for doubtful accounts $ 548,049 $ 126,000