Note 8 - Deferred Revenue Activity (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Royalty Arrangement [Member] | HealthCare Royalty Partners III, L.P. [Member]
Total Liability related to sale of future royalties, June 30, 2015
Proceeds from sale of future royalties, net *	[1]	17.8
Non-cash interest expense recognized		0.3
Total Liability related to sale of future royalties, June 30 2016		18.1
Non-cash interest expense recognized		$ 0.3

[1] Represents gross proceeds of $20.0 million less a royalty payment of $1.3 million and $0.9 in deferred financing costs.