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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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