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Note A - The Company and Summary of Significant Accounting Policies - Summary of Accounts Receivable (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable - current | $ 1,587,817 | $ 2,889,731
Accounts receivable - non current | 1,720,000 | 1,760,000
| 3,307,817 | 4,649,731
Allowance for doubtful accounts - current | (13,785) | (13,785)
Allowance for doubtful accounts - non current | (1,720,000) | (1,000,000)
| (1,733,785) | (1,013,785)
Accounts receivable, net of allowances for doubtful accounts | $ 1,574,032 | $ 3,635,946

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