Note 15 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Stockholders' Equity Note [Abstract]

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

Following is a summary of the warrant activity for the nine months ended September 30, 2015:

	Number of Warrants			Average Exercise Price		Weighted Average Remaining Contractual Term in Years
Outstanding at January 1, 2015		1,241,462		$	7.90		2.88
Granted		2,000,001			2.71		5.00
Exercised / surrendered		(1,062,912	)		2.10		-
Expired		(128,550	)		4.50		-
Outstanding at September 30, 2015		2,050,001			2.74		4.57
Exercisable at September 30, 2015		50,000			4.00		0.75

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

The Company estimated the fair value of its warrants as of December 31, 2014 using the Binomial option pricing model using the following assumptions:

	Series A Warrants			Series C Warrants			Placement Agent Warrants			Total
At December 31, 2014:
Market price of common stock ($)		2.81			2.81			2.81
Number of shares of common stock underlying the warrants		660,030			310,478			92,404			1,062,912
Exercise price ($)		8.48			8.53			8.48
Remaining contractual life (years):		3.29			3.29			3.29
Dividend yield:		–			–			–
Expected volatility:		110	%		110	%		110	%
Risk-free interest rate:		1.10	%		1.10	%		1.10	%
Fair value ($)		912,138			427,875			125,006			1,465,019