Note 4 - Treasury Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Disclosure Text Block Supplement [Abstract]
Stock Repurchase Program, Authorized Amount (in Dollars)		$ 50.0
Stock Repurchased During Period, Shares	189,536
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)	$ 11.69