Note 9 - Financial Derivatives (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2010	Jun. 30, 2009	Jun. 30, 2009 One-Month [Member]	Apr. 30, 2011 Six-Month [Member]	Jun. 30, 2010 Six-Month [Member]
Notional Amount of Foreign Currency Fair Value Hedge Derivatives	$ 49.8	$ 34.1
Derivative, Swaption Interest Rate			5.50%	7.50%
Notional Amount of Fair Value Hedge Instruments			$ 300.0	$ 250.0
Derivative, Variable Interest Rate (in Basis Points)					3.42%	4.09%	1.86%