Note 8 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Share-based Compensation, Activity [Table Text Block]

	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2016		3,499,475		$	1.21
Granted		--			--
Exercised		--			--
Forfeited or expired		(115,200	)		17.75
Outstanding at March 31, 2017		3,384,275		$	0.64
Exercisable at March 31, 2017		2,191,281		$	1.69

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

	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2016		32,751,578		$	0.07
Granted		--			--
Exercised		(983,334	)		0.05
Forfeited or expired		(1,112,001	)		0.57
Outstanding at March 31, 2017		30,656,243		$	0.05
Exercisable at March 31, 2017		30,656,243		$	0.05

Schedule of Stock by Class [Table Text Block]

Series B Convertible Preferred Stock	285,714
Series C Convertible Preferred Stock	57,363,520
Common Stock Purchase Warrants	30,656,243
Equity Incentive Plans	4,590,300
Total	92,895,777