Note 5 - Available-for-Sale Securities - Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Corporate Debt Securities [Member]
Amortized Cost	$ 11,449	$ 12,978
Gross Unrealized Losses	(5)	(6)
Fair Value	11,444	12,972
Corporate Bond Securities [Member]
Amortized Cost	$ 1,450	3,972
Gross Unrealized Losses		(2)
Fair Value	$ 1,450	3,970
Amortized Cost	12,899	16,950
Gross Unrealized Losses	(5)	(8)
Fair Value	$ 12,894	$ 16,942