Note 2 - Significant Accounting Policies - Schedule of Estimated Value of Options and Warrants (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	62.10%	65.00%
Risk-free interest	1.42%
Expected life (Year)	6 years 91 days	6 years 91 days	6 years 91 days
Minimum [Member]
Dividend yield
Expected volatility			60.00%
Risk-free interest		1.94%	1.97%
Expected life (Year)
Maximum [Member]
Dividend yield
Expected volatility			64.00%
Risk-free interest		2.00%	2.30%
Expected life (Year)

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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