Note 3 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Accounts receivable - current	$ 861,674	$ 1,577,031
Accounts receivable - non current	2,070,000	2,070,000
	2,931,674	3,647,031
Allowance for doubtful accounts - current	(13,785)	(13,785)
Allowance for doubtful accounts - non current	(1,000,000)	(500,000)
Accounts receivable, net of allowance for doubtful accounts	$ 1,917,889	$ 3,133,246

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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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business.

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- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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