Note 3 - Fair Value Measurements (Tables)

9 Months Ended

Mar. 31, 2017

Notes Tables

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

			Quoted Prices in		Significant
			Active Markets		Other		Significant
(in millions)			for Identical Assets		Observable Inputs		Unobservable Inputs
March 31, 2017	Total		(Level 1)		(Level 2)		(Level 3)
Cash equivalents	$	7.4	$	7.4	$	—	$	—
Short-term investments available-for-sale		25.8		—		25.8		—
Total	$	33.2	$	7.4	$	25.8	$	—

			Quoted Prices in		Significant
			Active Markets		Other		Significant
(in millions)			for Identical Assets		Observable Inputs		Unobservable Inputs
June 30, 2016	Total		(Level 1)		(Level 2)		(Level 3)
Cash equivalents	$	1.5	$	1.5	$	—	$	—
Short-term investments available-for-sale		19.3		10.0		9.3		—
Total	$	20.8	$	11.5	$	9.3	$	—

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

(in millions)			Unrealized		Unrealized
March 31, 2017	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	7.4	$	-	$	-	$	7.4
Corporate notes		19.8		-		-		19.8
Commercial paper		5.0		-		-		5.0
Certificates of deposit		1.0		-		-		1.0
Total	$	33.2	$	-	$	-	$	33.2

(in millions)			Unrealized		Unrealized
June 30, 2016	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	1.5	$	—	$	—	$	1.5
Debt securities of U.S. government agencies		2.0		—		—		2.0
U.S. Treasury securities		7.0		—		—		7.0
Corporate notes		2.9		0.1		—		3.0
Certificates of deposit		7.3		—		—		7.3
Total	$	20.7	$	0.1	$	—	$	20.8