Note 2 - Stock-Based Compensation (Detail) - 2004 Plan Fair Value Assumptions (Two Thousand Four Equity Incentive Plan [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Two Thousand Four Equity Incentive Plan [Member]
Expected term (years)	4 years 36 days	4 years 36 days	4 years 36 days	4 years
Expected volatility	52.10%	52.30%	53.40%	52.80%
Risk-free interest rate	0.50%	1.10%	0.60%	1.30%
Dividend yield	0.00%	0.00%	0.00%	0.00%