Note 4 - Equity, Stock Plan and Warrants (Detail) - Schedule of Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 2013
Exercised	371,718
Options [Member]
Outstanding at December 31, 2012	2,254,514
Granted	47,000
Forfeited or expired	0
Exercised	(371,718)
Outstanding at March 31, 2013	1,929,796
Vested and exercisable at March 31, 2013	1,338,258
Weighted Exercise Price [Member]
Outstanding at December 31, 2012 (in Dollars per share)	7.08
Granted (in Dollars per share)	14.57
Forfeited or expired (in Dollars per share)	0
Exercised (in Dollars per share)	6.97
Outstanding at March 31, 2013 (in Dollars per share)	7.28
Vested and exercisable at March 31, 2013 (in Dollars per share)	7.20