Note 7 - Stock Option Activity (Details)	3 Months Ended
	Sep. 30, 2015 $ / shares shares
Outstanding at June 30, 2015 (in shares)	3,364,117
Outstanding at June 30, 2015 (in dollars per share) | $ / shares	$ 5.58
Granted (in shares)	1,047,500
Granted (in dollars per share) | $ / shares	$ 2.45
Exercised (in shares)
Exercised (in dollars per share) | $ / shares
Forfeited or expired (in shares)	(833)
Forfeited or expired (in dollars per share) | $ / shares	$ 75.81
Outstanding at September 30, 2015 (in shares)	4,403,284
Outstanding at September 30, 2015 (in dollars per share) | $ / shares	$ 4.83
Outstanding at September 30, 2015	7 years 109 days