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Note A - The Company and Summary of Significant Accounting Policies - Summary of Accounts Receivable (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable - current	$ 2,889,731	$ 1,577,031
Accounts receivable - non current	1,760,000	2,070,000
	4,649,731	3,647,031
Allowance for doubtful accounts - current	(13,785)	(13,785)
Allowance for doubtful accounts - non current	(1,000,000)	(500,000)
	(1,013,785)	(513,785)
Accounts receivable, net of allowances for doubtful accounts	$ 3,635,946	$ 3,133,246

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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