Note 3 - Fair Value Measurements (Tables)

6 Months Ended

Dec. 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
December 31 , 2017	Total		(Level 1)		(Level 2)		(Level 3)
Cash equivalents	$	18.7	$	7.0	$	11.7	$	—
Short-term investments available-for-sale		—		—		—		—
Total	$	18.7	$	7.0	$	11.7	$	—

(in millions)			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
June 30, 2017	Total		(Level 1)		(Level 2)		(Level 3)
Cash equivalents	$	10.9	$	5.9	$	5.0	$	—
Short-term investments available-for-sale	20.9			—		20.9		—
Total	$	31.8	$	5.9	$	25.9	$	—

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

(in millions)			Unrealized		Unrealized
December 31 , 2017	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	7.0	$	-	$	-	$	7.0
Corporate notes		6.5		-		-		6.5
Commercial paper		5.2		-		-		5.2
Total	$	18.7	$	-	$	-	$	18.7

(in millions)			Unrealized		Unrealized
June 30, 2017	At Cost		Gains		(Losses)		At Fair Value
Money market funds	$	5.9	$	—	$	—	$	5.9
Commercial paper		8.5		—		—		8.5
Corporate notes		17.4		—		—		17.4
Total	$	31.8	$	—	$	—	$	31.8