Note 9 - Fair Value Measurement (Details) - Fair Value Assumptions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk free interest rate		0.13%
Dividend yield	0.00%	0.00%
Expected volatility
Conversion Feature Liability [Member]
Expected life (range in years)
Conversion feature liability
Warrant Liability [Member]
Expected life (range in years)
Conversion feature liability
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk free interest rate	0.48%
Expected volatility	91.00%	119.80%
Minimum [Member] \| Conversion Feature Liability [Member]
Expected life (range in years)
Conversion feature liability	1 year 3 months	1 year
Minimum [Member] \| Warrant Liability [Member]
Expected life (range in years)
Conversion feature liability	0 years	1 year
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk free interest rate	1.20%
Expected volatility	132.20%	155.70%
Maximum [Member] \| Conversion Feature Liability [Member]
Expected life (range in years)
Conversion feature liability	2 years 3 months	1 year 3 months
Maximum [Member] \| Warrant Liability [Member]
Expected life (range in years)
Conversion feature liability	3 years 3 days	2 years 3 months

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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.

+ References

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- Definition

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

+ References

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- Definition

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

+ References

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