Note 4 - Financial Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Financial assets:
Cash and cash equivalents	$ 49.7	$ 44.7	$ 81.7	$ 66.8
Short-term investments	19.3	12.9
Accounts receivable, net of allowance	0.7	12.6
Total current financial assets	69.7	70.2
Financial liabilities:
Accounts payable and current accrued liabilities	7.5	8.3
Short-term note payable	0.4	0.2
Total current financial liabilities	7.9	8.5
Net financial assets	$ 61.8	$ 61.7