Note 5 - Option Activity For Stock Option Plans (Details) - Employee Stock Option [Member]	3 Months Ended
	Sep. 30, 2015 $ / shares shares
Outstanding, June 30, 2015 (in shares) | shares	2,952,062
Outstanding, June 30, 2015 (in dollars per share)	$ 1.28
Granted (in shares) | shares	677,500
Granted (in dollars per share)	$ 0.64
Forfeited (in shares) | shares	(168,245)
Forfeited (in dollars per share)	$ 1.28
Expired (in shares) | shares	(100,000)
Expired (in dollars per share)	$ 2.02
Outstanding, September 30, 2015 (in shares) | shares	3,361,317
Outstanding, September 30, 2015 (in dollars per share)	$ 1.12
Outstanding at September 30, 2015	5 years 219 days
Vested and Expected to Vest at September 30, 2015 (in shares) | shares	2,680,552
Vested and Expected to Vest at September 30, 2015 (in dollars per share)	$ 1.13
Vested and Expected to Vest at September 30, 2015	5 years 182 days
Exercisable at September 30, 2015 (in shares) | shares	1,279,965
Exercisable at September 30, 2015 (in dollars per share)	$ 1.29
Exercisable at September 30, 2015	4 years 182 days