Note 4 - Accrued and Other Current Liabilities - Summary of Accrued and Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
Professional fees	$ 0.5	$ 0.1
Salary and benefits	0.5	0.6
Research and development expenses	4.6	2.2
Other accrued expenses		0.7
Total accrued expenses and other liabilities	$ 5.6	$ 3.6