Note 2 - Stock-Based Compensation (Detail) - 2004 Employee Stock Purchase Plan Fair Value Assumptions (Two Thousand Four Employee Stock Purchase Plan [Member])	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Two Thousand Four Employee Stock Purchase Plan [Member]
Expected term (years)	6 months	6 months
Expected volatility	50.70%	37.50%
Risk-free interest rate	0.10%	0.20%
Dividend yield	0.00%	0.00%