Note 8 - Common Stock (Tables)

6 Months Ended

Jun. 30, 2015

Notes Tables

Schedule of Share-based Compensation, Activity [Table Text Block]

	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2014		1,183,100		$	3.50
Granted		26,400			0.15
Exercised		--			--
Forfeited or expired		(32,000	)		0.94
Outstanding at June 30, 2015		1,177,500		$	3.49
Exercisable at June 30, 2015		756,094		$	5.25

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

	Number of Shares		Weighted Average Exercise Price
Outstanding at December 31, 2014		5,108,826	$	0.66
Issued – Series D Warrants (1)		16,666,666		0.17
Issued – Series E Warrants (1)		16,666,666		0.14
Issued – Series F Warrants (1)		16,666,666		0.17
Issued – Placement Agent Warrants (1)		1,333,333		0.17
Outstanding at June 30, 2015		56,442,157	$	0.20
Exercisable at June 30, 2015		39,775,491	$	0.21

Schedule of Stock by Class [Table Text Block]

Series B Convertible Preferred Stock	285,714
Series C Convertible Preferred Stock	21,126,760
Common Stock Purchase Warrants	56,442,157
Equity Incentive Plans	1,197,529
Total	79,052,160