Note 14 - Warrants

6 Months Ended

Jun. 30, 2016

Notes to Financial Statements

Warrants [Text Block]

Note 14. Warrants

Common Stock Warrants

Following is a summary of all warrant activity for the six months ended June 30, 2016: 

Warrants	Number of Warrants Issued			Weighted Average Exercise Price
Warrants outstanding at December 31, 2015		5,894,675		$	6.37
Warrants issued during the six months ended June 30, 2016 (see Note 11)		10,923,528			1.13
Warrants expired during the six months ended June 30, 2016		–
Warrants outstanding at June 30, 2016		16,818,203		$	2.97
Aggregate intrinsic value of outstanding warrants at June 30, 2016	$	2,646,000
Weighted average remaining contractual terms at June 30, 2016 (in years)		2.86	(1)

(1) Does not include the Pre-Funded Warrants issued in the June 2016 Offering as these warrants have no expiration date.