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Note 13 - Warrants (Tables)

6 Months Ended

Jun. 30, 2014

Note 13 - Warrants (Tables) [Line Items]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Warrants		Number of Warrants Issued				Weighted Average Exercise Price

Warrants outstanding at December 31, 2013			3,268,013			$	10.43

Warrants granted in connection with the January 2014 Common Stock Offering, as more fully described in Note 11			1,801,802			$	4.10

Warrants exercised for common stock		–				–

Warrants outstanding at June 30, 2014			5,069,815			$	8.18

Aggregate intrinsic value of outstanding warrants at June 30, 2014		$	-

Weighted average remaining contractual terms (in years)			2.9

Schedule of Common Stock Warrant Liability Valuation Assumptions [Table Text Block]

		June 30, 2014				December 31, 2013
Risk-free interest rate			0.11- 1.62	%			0.13	%
Expected volatility			31.6 – 103.4	%			64.74	%
Expected life (in years)			0.75 – 4.5				1.25
Expected forfeiture rate			0.0	%			0.0	%
Expected dividend yield			0.00	%			0.00	%

		June 3, 2013				June 30, 2013

Risk-free interest rate			0.50 - 1.03%				0.36 - 1.41%
Expected volatility			102.9 - 110.9%				103.4 - 147.3%
Expected life (in years)			3.1 - 4.7				1.75 - 4.70
Expected forfeiture rate			0.0	%			0.0	%
Expected dividend yield			0.00	%			0.00	%

Schedule of Common Stock Warranty Liability [Table Text Block]

Beginning balance as of January 1, 2014		$	3,026

Fair value of warrants classified as liability (see note 10)			476,261

Loss from the adjustment for the change in fair value included in net income			15,587
Ending balance as of June 30, 2014		$	494,874

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

Shares of common stock associated with warrants issued in the September 2009 registered direct offering

Expiration Date of

warrants issued in the September 2009 registered direct offering

Strike

Price

Per Share

Fair Value on

June 30, 2013

448,478

March 31, 2015

$

23.58

$

0.71

Waived Warrants [Member]

Note 13 - Warrants (Tables) [Line Items]

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				Per Share Fair Value on June 30, 2013

			1,323,496		2/26/2018		$	5.31			$	6.60			$	3.33
			31,243		7/25/2016		$	18.99			$	4.41			$	1.93
			12,628		7/6/2016		$	14.09			$	4.81			$	2.15
			31,448		11/25/2017		$	12.47			$	5.56			$	2.66

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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