Note 1 - Description of Business, Basis of Presentation and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure Text Block [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended June 30,					Six Months Ended June 30,
	2015		2014			2015		2014
Numerator:
Net income (loss) attributable to common stockholders	$	1,209,931	$	(1,437,758	)	$	1,931,985	$	(4,861,119	)
Denominator:
Weighted-average shares outstanding		45,191,563		38,798,706			45,051,576		38,649,766
Effect of dilutive securities		3,831,059		-			3,573,492		-
Weighted-average diluted shares		49,022,622		38,798,706			48,625,068		38,649,766
Basic income (loss) per share	$	0.03	$	(0.04	)	$	0.04	$	(0.13	)
Diluted income (loss) per share	$	0.02	$	(0.04	)	$	0.04	$	(0.13	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Stock options		9,083,998		9,786,546		9,341,565		9,786,546
Unvested restricted stock awards		-		1,715,627		-		1,715,627
Warrants		2,812,414		2,812,414		2,812,414		2,812,414
Convertible preferred stock		1,479,949		1,479,949		1,479,949		1,479,949
Totals		13,376,361		15,794,536		13,633,928		15,794,536