Note 5 - Stockholders' Equity (Detail) - Stock Purchase Warrant Transactions (USD $)	3 Months Ended
	Mar. 31, 2013
Outstanding at December 31, 2012 (in Shares)	11,225,559
Outstanding at December 31, 2012	$ 2.06
Issued (in Dollars)	$ 0
Issued	$ 0
Exercised (in Shares)	(1,766,667)
Exercised	$ 0.60
Forfeited or expired (in Shares)	0
Forfeited or expired	$ 0
Outstanding at March 31, 2013 (in Shares)	9,458,892
Outstanding at March 31, 2013	$ 2.29
Exercisable at March 31, 2013 (in Shares)	8,292,226
Exercisable at March 31, 2013	$ 2.47