Note 6 - Stockholders' Equity - Activity Under the Equity Incentive Plans (Details)	3 Months Ended
	Sep. 30, 2017 $ / shares shares
Outstanding, beginning balance (in shares) | shares	4,574,000
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 3.02
Granted (in shares) | shares	0
Granted (in dollars per share) | $ / shares
Exercised/Released (in shares) | shares
Exercised/Released (in dollars per share) | $ / shares
Cancelled (in shares) | shares	(124,000)
Cancelled (in dollars per share) | $ / shares	$ 3.49
Outstanding, ending balance (in shares) | shares	4,450,000
Outstanding, ending balance (in dollars per share) | $ / shares	$ 3.01
Vested and expected to vest (in shares) | shares	4,235,000
Vested and expected to vest (in dollars per share) | $ / shares	$ 3.05
Restricted Stock Units (RSUs) [Member]
Outstanding, beginning balance (in shares) | shares	146,000
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 3.93
Granted (in shares) | shares	115,000
Granted (in dollars per share) | $ / shares	$ 1.99
Exercised/Released (in shares) | shares	(172,000)
Exercised/Released (in dollars per share) | $ / shares	$ 2.61
Cancelled (in shares) | shares
Cancelled (in dollars per share) | $ / shares
Outstanding, ending balance (in shares) | shares	89,000
Outstanding, ending balance (in dollars per share) | $ / shares	$ 3.96