Note 8 - Share-based Compensation - Stock Option Activity (Details)	3 Months Ended
	Sep. 30, 2016 $ / shares shares
Outstanding (in shares) | shares	4,751,423
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 4.07
Granted (in shares) | shares	1,310,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 1.33
Exercised (in shares) | shares
Exercised, weighted average exercise price (in dollars per share) | $ / shares
Forfeited or expired (in shares) | shares	(254,523)
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	$ 2.59
Outstanding (in shares) | shares	5,806,900
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.52
Outstanding, weighted-average remaining contractual term	7 years 146 days