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Note 9 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Note 9 - Stockholders' Equity (Tables) [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Assumptions used in the valuation of the warrants issued in the February 2013 Preferred Stock Offering are as follows:

Risk-free interest rate			0.78	%
Expected volatility			102.23	%
Expected life (in years)			5.0
Expected forfeiture rate			0.0	%
Expected dividend yield			0.00	%

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Shares of common stock associated with the Waived Warrants		Expiration Date of Waived Warrants		Strike Price				Per Share Fair Value on June 3, 2013
5,955,736		2/26/2018		$	1.18			$	1.4670
140,593		7/25/2016		$	4.22			$	0.9791
56,827		7/6/2016		$	3.13			$	1.0693
141,518		11/25/2017		$	2.77			$	1.2353

May Offering [Member]

Note 9 - Stockholders' Equity (Tables) [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Assumptions used in the valuation of the Waived Warrants associated with the Common Stock Offering are as follows:

Risk-free interest rate		0.50	-	1.03	%
Expected volatility		102.86	-	110.88	%
Expected life (in years)		3.1	-	4.7
Expected forfeiture rate			0.0		%
Expected dividend yield			0.00		%

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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