Note 7 - Stock-Based Compensation (Details) - Summary of Status of All Stock Option Plans (USD $)	3 Months Ended
	Mar. 31, 2014
Summary of Status of All Stock Option Plans [Abstract]
Outstanding – December 31, 2013	12,019,328
Outstanding – December 31, 2013	$ 0.21
Exercised	(215,757)
Exercised	$ 0.20
Forfeited or expired	(241,516)
Forfeited or expired	$ 0.20
Outstanding – March 31, 2013	11,562,055
Outstanding – March 31, 2013	$ 0.20
Outstanding – March 31, 2013	5 years 135 days
Outstanding – March 31, 2013	$ 246,800