Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2013

Stockholders' Equity Note [Abstract]

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	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
2008 Stock Option Plan	2012		9,469,194		4,262,500		(390,447	)		(1,457,247	)		11,884,000
2005 Equity Incentive Plan	2012		1,705,000		350,000		(25,000	)		(582.500	)		1,447,500
1998 Stock Option/Stock Issuance Plan	2012		432,500		—		(200,000	)		(95,000	)		137,500
Supplemental Stock Option Agreement	2012		30,000		—		—			(25,000	)		5,000
			11,636,694		4,612,500		(615,447	)		(2,159,747	)		13,474,000

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

	2013					2012
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Beginning		14,174,000		$	0.20		11,636,694		$	0.18
Granted		723,000		$	0.37		5,312,500		$	0.22
Exercised		(2,464,332	)	$	0.18		(615,447	)	$	0.08
Forfeited or expired		(413,340	)	$	0.21		(2,159,747	)	$	0.20
Ending		12,019,328		$	0.21		14,174,000		$	0.20
Exercisable at year-end		12,019,328		$	0.21		14,174,000		$	0.20
Vested or expected to vest at year-end		11,857,821		$	0.21		13,901,838		$	0.20
Weighted average fair value of options granted during the period				$	0.31				$	0.22

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	-	$0.1800		3,439,061		6.03	$	0.13		3,439,061	$	0.13
$0.1801	-	$0.2200		3,271,085		4.83	$	0.20		3,271,085	$	0.20
$0.2201	-	$0.2300		2,776,182		5.92	$	0.23		2,776,182	$	0.23
$0.2301	-	$0.4450		2,533,000		8.62	$	0.33		2,533,000	$	0.33
				12,019,328		6.22	$	0.21		12,019,328	$	0.21

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

	2013					2012
	Shares			Weighted Average Fair Value		Shares			Weighted Average Fair Value
Beginning unreleased		4,043,123		$	0.18		—		$	—
Awarded		1,867,500		$	0.44		4,157,500		$	0.18
Released		(1,657,040	)	$	0.22		(114,377	)	$	0.18
Forfeited		(315,157	)	$	0.28		—		$	—
Ending unreleased		3,938,426		$	0.28		4,043,123		$	0.18