Note 6 - Stock-Based Compensation (Details) (USD $)	3 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended
	Sep. 30, 2013	May 31, 2012 Stock Options And Stock Appreciation Rights [Member] 2012 Stock Incentive Plan [Member]	Apr. 03, 2013 Employee Stock Option [Member] 2012 Stock Incentive Plan [Member] Chief Financial Officer [Member]	May 31, 2012 Non Employee Director [Member] 2012 Stock Incentive Plan [Member]	Dec. 31, 2004 2004 Stock Incentive Plan [Member]	Apr. 03, 2013 2012 Stock Incentive Plan [Member] Chief Financial Officer [Member]	Sep. 30, 2013 2012 Stock Incentive Plan [Member] Chief Financial Officer [Member]	Jun. 04, 2013 2012 Stock Incentive Plan [Member]	May 31, 2012 2012 Stock Incentive Plan [Member]
Note 6 - Stock-Based Compensation (Details) [Line Items]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in Shares)					3,750,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year Two					25.00%
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year Three					25.00%
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year Four					50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years		1 year			4 years
Share Based Compensation Arrangement By Share Based Payment Award Awards Exercise Period					10 years				10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)									4,000,000
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Year Two		25.00%						25.00%
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Year Three		25.00%						25.00%
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Year Four		50.00%						50.00%
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Period				1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares)						120,000		1,150,100
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)						$ 20.54		$ 23.34
Share Based Compensation Arrangement By Share Based Payment Award Option Expiration Period						6 years		6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)						$ 5.64		$ 7.21
Share-Based Compensation Arrangement By-Share Based Payment Award, Forfeiture Rate (in Dollars)	$ 0.0746
Share-Based Compensation Arrangement By-Share Based Payment Award, Increase (Decrease) in Forfeiture Rate (in Dollars)							$ 0.0109