Note 4 - Valuation Assumptions (Details) - Fair Value, Inputs, Level 3 [Member] - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Series 2023 PIK Note Derivative Liability [Member]
Market price and estimated fair value of stock (in dollars per share)	$ 0.18	$ 0.28
Exercise price (in dollars per share)	$ 1.28	$ 1.36
Term (years)	7 years 29 days	7 years 211 days
Expected volatility	86.00%	72.90%
Risk-free interest rate	1.30%	2.12%
Series A PIK Note Derivative Liability [Member]
Market price and estimated fair value of stock (in dollars per share)	$ 0.18	$ 0.28
Exercise price (in dollars per share)	$ 0.83	$ 0.92
Term (years)	7 years 29 days	7 years 211 days
Expected volatility	86.00%	72.90%
Risk-free interest rate	1.30%	2.12%

Agreed upon price for the exchange of the underlying asset.

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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Risk-free interest rate assumption used in valuing an instrument.

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Price of a single share of a number of saleable stocks of a company.

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