Note 2 - Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

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

	Three Months Ended March 31,
	2014		2013
Stock options		9,147,214		8,844,180
Unvested restricted stock awards		1,309,750		-
Warrants		2,812,414		3,197,853
Convertible preferred stock		1,479,949		1,479,949
Totals		14,749,327		13,521,982