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Note 3 - Summary of Significant Accounting Policies - Assets Measured at Fair Value (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale Securities	$ 1,825,923
Reported Value Measurement [Member]
Available-for-sale Securities	1,825,923
Derivative warrants liabilities	(504,326)	$ (516,870)
Estimate of Fair Value Measurement [Member]
Available-for-sale Securities	1,825,923
Derivative warrants liabilities	(504,326)	(516,870)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale Securities
Derivative warrants liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale Securities	1,825,923
Derivative warrants liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale Securities
Derivative warrants liabilities	$ (504,326)	$ (516,870)

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313

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