Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Schedule of Stockholders Equity [Table Text Block]

Gross cash proceeds	$	3,390,000
Less: gross proceeds allocated to warrants liability – investors		(1,356,000	)
Gross proceeds allocated to additional paid-in capital and common stock		2,034,000
Less: cash issuance costs – legal fees		(20,000	)
Recorded in additional paid-in capital and common stock	$	2,014,000

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

		Options Outstanding
	Year	Beginning of Year		Granted		Exercised			Cancelled			End of Year
2008 Stock Option Plan	2014		9,618,828		—		(246,818	)		(2,922,010	)		6,450,000
2005 Equity Incentive Plan	2014		972,500		—		(10,000	)		(702,500	)		260,000
Supplemental Stock Option Agreement	2014		5,000		—		—			—			5,000
			10,596,328		—		(256,818	)		(3,624,510	)		6,715,000
2008 Stock Option Plan	2013		11,884,000		—		(1,851,832	)		(413,340	)		9,618,828
2005 Equity Incentive Plan	2013		1,447,500		—		(475,000	)		—			972,500
1998 Stock Option/Stock Issuance Plan	2013		137,500		—		(137,500	)		—			—
Supplemental Stock Option Agreement	2013		5,000		—		—			—			5,000
			13,474,000		—		(2,464,332	)		(413,340	)		10,596,328

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

	2014					2013
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Beginning		12,019,328		$	0.21		14,174,000		$	0.20
Granted		3,449,999		$	0.14		723,000		$	0.37
Exercised		(256,818	)	$	0.19		(2,464,332	)	$	0.18
Forfeited or expired		(4,924,510	)	$	0.24		(413,340	)	$	0.21
Ending		10,287,999		$	0.18		12,019,328		$	0.21
Exercisable at year-end		10,287,999		$	0.18		12,019,328		$	0.21
Vested or expected to vest at year-end		10,144,482		$	0. 18		11,857,821		$	0.21
Weighted average fair value of options granted during the period				$	0.18				$	0.31

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

	Options Outstanding				Options Exercisable
Range of Exercise Price	Number Outstanding		Weighted Average  Remaining Contractual  Life (Years)		Weighted  Average  Exercise Price		Number Exercisable		Weighted Average Exercise Price
$0.0500-$0.0600		783,000		4.59	$	0.0532		783,000	$	0.0532
$0.1213-$0.1213		1,400,000		9.42	$	0.1213		1,400,000	$	0.1213
$0.1370-$0.1600		1,095,000		7.67	$	0.1523		1,095,000	$	0.1523
$0.1650-$0.1650		135,000		1.74	$	0.1650		135,000	$	0.1650
$0.1690-$0.1690		1,699,999		9.92	$	0.1690		1,699,999	$	0.1690
$0.1700-$0.2000		1,210,000		7.04	$	0.1807		1,210,000	$	0.1807
$0.2020-$0.2200		854,000		5.15	$	0.2050		854,000	$	0.2050
$0.2300-$0.2300		1,878,000		6.02	$	0.2300		1,878,000	$	0.2300
$0.2800-$0.2800		1,200,000		6.69	$	0.2800		1,200,000	$	0.2800
$0.3800-$0.4450		33,000		6.97	$	0.4253		33,000	$	0.4253
$0.0500-$0.4450		10,287,999		7.27	$	0.1811		10,287,999	$	0.1811

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

	2014						2013
	Shares			Weighted Average Fair Value		Shares			Weighted  Average  Fair Value
Beginning unreleased		3,938,426		$	0.28		4,043,123		$	0.18
Awarded		4,372,000		$	0.16		1,867,500		$	0.44
Released		(1,474,778	)	$	0.25		(1,657,040	)	$	0.22
Forfeited		(2,520,665	)	$	0.27		(315,157	)	$	0.28
Ending unreleased		4,314,983		$	0.18		3,938,426		$	0.28