Note 6 - Stock Compensation Expense (Detail) - The following table summarizes information for options currently outstanding and exercisable: (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Exercise Price Range $5.47-5.72 [Member]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 5.47
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 5.72
Options Outstanding - Number (in Shares)	917,305
Options Outstanding - Wtd. Avg. Remaining Life (years)	7 years
Options Outstanding - Wtd. Avg. Exercise Price	$ 5.71
Options Outstanding - Aggregate Intrinsic Value (in Dollars)	$ 1,869,629
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 5.47
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 5.72
Options Exercisable - Number (in Shares)	262,305
Options Exercisable - Wtd. Avg. Remaining Life (years)	7 years
Options Exercisable - Wtd. Avg. Exercise Price	$ 5.69
Options Exercisable - Aggregate Intrinsic Value (in Dollars)	539,979
Exercise Price Range $8.02-8.60 [Member]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 8.02
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 8.60
Options Outstanding - Number (in Shares)	105,175
Options Outstanding - Wtd. Avg. Remaining Life (years)	5 years
Options Outstanding - Wtd. Avg. Exercise Price	$ 8.32
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 8.02
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 8.60
Options Exercisable - Number (in Shares)	67,675
Options Exercisable - Wtd. Avg. Remaining Life (years)	2 years
Options Exercisable - Wtd. Avg. Exercise Price	$ 8.49
Exercise Price Range $11.94-24.12 [Member]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 11.94
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 24.12
Options Outstanding - Number (in Shares)	115,000
Options Outstanding - Wtd. Avg. Remaining Life (years)	4 years
Options Outstanding - Wtd. Avg. Exercise Price	$ 15.40
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 11.94
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 24.12
Options Exercisable - Number (in Shares)	115,000
Options Exercisable - Wtd. Avg. Remaining Life (years)	4 years
Options Exercisable - Wtd. Avg. Exercise Price	$ 15.40
Exercise Price Range $31.07-36.73 [Member]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 31.07
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 36.73
Options Outstanding - Number (in Shares)	75,000
Options Outstanding - Wtd. Avg. Remaining Life (years)	3 years
Options Outstanding - Wtd. Avg. Exercise Price	$ 33.33
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 31.07
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 36.73
Options Exercisable - Number (in Shares)	75,000
Options Exercisable - Wtd. Avg. Remaining Life (years)	3 years
Options Exercisable - Wtd. Avg. Exercise Price	$ 33.33
Exercise Price Range $5.47-36.73 [Member]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 5.47
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 36.73
Options Outstanding - Number (in Shares)	1,212,480
Options Outstanding - Aggregate Intrinsic Value (in Dollars)	1,869,629
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 5.47
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 36.73
Options Exercisable - Number (in Shares)	519,980
Options Exercisable - Aggregate Intrinsic Value (in Dollars)	$ 539,979