Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable
June 30, 2014	Total		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents	$	36.9	$	36.9	$	—	$	—
Long-term investments available-for-sale		10.0		—		10.0		—
Total	$	46.9	$	36.9	$	10.0	$	—

Unrealized Gain (Loss) on Investments [Table Text Block]

			Unrealized		Unrealized
June 30, 2014	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	36.9	$	—	$	—	$	36.9
Debt securities of U.S. government agencies		4.9		—		—		4.9
US Treasury securities		5.1		—		—		5.1
Total	$	46.9	$	—	$	—	$	46.9

			Unrealized		Unrealized
June 30, 2013	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	—	$	—	$	—	$	—
Debt securities of U.S. government agencies		—		—		—		—
US Treasury securities		—		—		—		—
Total	$	—		—		—		—