Note 5 - Net Income Per Share (Detail) - Computation for Weighted Average Shares	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Weighted average shares outstanding (basic)	22,668,020	22,495,605	22,652,844	22,392,427
Incremental shares from assumed option exercise	411,719	260,401	457,520	190,931
Weighted average shares outstanding (diluted)	23,079,739	22,756,006	23,110,364	22,583,358