Note 6 - Stockholders' Equity and Equity Compensation (Detail) - Additional Stock Option Information (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011
Amount collected from stock option exercises	$ 840,000	$ 3,551,000	$ 2,100,000
Total intrinsic value of stock option exercises	100,000		1,000,000
Tax benefit of stock option exercises recorded in additional paid-in-capital	100,000		100,000
Aggregate intrinsic value of outstanding stock options at September 30, 2012	3,300,000
Aggregate intrinsic value of exercisable stock options at September 30, 2012	$ 3,000,000