Note 3 - Fair Value Measurements (Tables)

9 Months Ended

Mar. 31, 2016

Notes Tables

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

			Quoted Prices in
			Active Markets for		Significant Other		Significant
(in millions)			Identical Assets		Observable Inputs		Unobservable
March 31 , 201 6	Total		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents	$	26.2	$	25.5	$	0.7	$	—
Short-term investments available-for-sale		18.4		10.9		7.5		—
Long-term investments available-for-sale		1.0		—		1.0		—
Total	$	45.6	$	36.4	$	9.2	$	—

			Quoted Prices in
			Active Markets for		Significant Other		Significant
(in millions)			Identical Assets		Observable Inputs		Unobservable
June 30, 2015	Total		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents	$	6.3	$	6.3	$	—	$	—
Short-term investments available-for-sale		12.9		12.9		—		—
Long-term investments available-for-sale		7.9		—		7.9		—
Total	$	27.1	$	19.2	$	7.9	$	—

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

(in millions)			Unrealized		Unrealized
March 31 , 201 6	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	25.5	$	—	$	—	$	25.5
Debt securities of U.S. government agencies		2.0		—		—		2.0
U.S. Treasury securities		7.0		—		—		7.0
Corporate notes		3.9		—		—		3.9
Certificates of deposit		7.2		—		—		7.2
Total	$	45.6	$	—	$	—	$	45.6

(in millions)			Unrealized		Unrealized
June 30, 2015	At Cost		Gains		(Losses)			At Fair Value
Money market funds	$	6.3	$	—	$	—		$	6.3
Debt securities of U.S. government agencies		6.5		—		—			6.5
U.S. Treasury securities		9.6		—		(0.1	)		9.5
Corporate notes		2.9		—		—			2.9
Certificates of deposit		1.9		—		—			1.9
Total	$	27.2	$	—	$	(0.1	)	$	27.1