Note 2 - Stock-Based Compensation (Detail) - 2004 Employee Stock Purchase Plan	9 Months Ended
	Sep. 30, 2012
Available Shares as of December 31, 2011	3,693,210
2012 Additions to Plan	676,520
2012 Purchases	(151,770)
Available Shares as of September 30, 2012	4,217,960