Note 4 - Accrued and Other Current Liabilities - Summary of Accrued and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Jun. 30, 2016
Professional fees	$ 0.4	$ 0.1
Salary and benefits	0.4	0.6
Research and development expenses	2.2	2.2
Other accrued expenses		0.7
Total accrued expenses and other liabilities	$ 3.0	$ 3.6