Note 9 - Stockholders' Equity (Details) - Summary of Information About Stock Options Outstanding (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding (in Shares)	12,019,328
Weighted Average Remaining Contractual Life Years	6 years 80 days
Options Outstanding, Weighted Average Exercise Price	$ 0.21
Options Exercisable (in Shares)	12,019,328
Options Exercisable, Weighted Average Exercise Price	$ 0.21
Exercise Price Range $0.5000 - $0.1800 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 0.0500
Range of Exercise Price, Upper Limit	$ 0.1800
Options Outstanding (in Shares)	3,439,061
Weighted Average Remaining Contractual Life Years	6 years 10 days
Options Outstanding, Weighted Average Exercise Price	$ 0.13
Options Exercisable (in Shares)	3,439,061
Options Exercisable, Weighted Average Exercise Price	$ 0.13
Exercise Price Range $0.1801 - $0.2200 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 0.1801
Range of Exercise Price, Upper Limit	$ 0.2200
Options Outstanding (in Shares)	3,271,085
Weighted Average Remaining Contractual Life Years	4 years 302 days
Options Outstanding, Weighted Average Exercise Price	$ 0.20
Options Exercisable (in Shares)	3,271,085
Options Exercisable, Weighted Average Exercise Price	$ 0.20
Exercise Price Range $0.2201 - $0.2300 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 0.2201
Range of Exercise Price, Upper Limit	$ 0.2300
Options Outstanding (in Shares)	2,776,182
Weighted Average Remaining Contractual Life Years	5 years 335 days
Options Outstanding, Weighted Average Exercise Price	$ 0.23
Options Exercisable (in Shares)	2,776,182
Options Exercisable, Weighted Average Exercise Price	$ 0.23
Exercise Price Range $0.2301 - $0.4450 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 0.2301
Range of Exercise Price, Upper Limit	$ 0.4450
Options Outstanding (in Shares)	2,533,000
Weighted Average Remaining Contractual Life Years	8 years 226 days
Options Outstanding, Weighted Average Exercise Price	$ 0.33
Options Exercisable (in Shares)	2,533,000
Options Exercisable, Weighted Average Exercise Price	$ 0.33