Note 8 - Fair Values of Financial Instruments (Details) - Fair Value Measurement of Warrant Liabilities and Derivative Liabilities (Warrant and Derivative Liabilities [Member])	3 Months Ended
Mar. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected dividends	0.00%
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Risk free interest rate	0.42%
Expected term	2 years 146 days
Volatility of stock price	132.90%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Risk free interest rate	0.67%
Expected term	2 years 222 days
Volatility of stock price	136.20%

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 (e)

-URI http://asc.fasb.org/extlink&oid=25499696&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.

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- Definition

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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