Note 4 - Stockholders' Equity (Detail) - Summary of option award activity under the Equity Incentive Plan: (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
December 31, 2012	5,016,916
December 31, 2012 (in Dollars per share)	$ 4.54
December 31, 2012	404,500
December 31, 2012 (in Dollars per share)	$ 2.30
Granted	60,000
Granted (in Dollars per share)	$ 1.58
Granted	60,000
Granted (in Dollars per share)	$ 1.14	$ 3.22
Vested	(88,000)
Vested (in Dollars per share)	$ 3.26
Forfeited, Canceled	(110,163)
Forfeited, Canceled (in Dollars per share)	$ 1.68
Forfeited, Canceled	(100,000)
Forfeited, Canceled (in Dollars per share)	$ 0.87
March 31, 2013	4,966,753
March 31, 2013 (in Dollars per share)	$ 4.57
March 31, 2013	276,500
March 31, 2013 (in Dollars per share)	$ 2.26