Note 7 - Stockholders' Equity - Option Activity for Stock Option Plans (Details) - Employee Stock Option [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Outstanding, options (in shares) | shares	104,378
Outstanding, weighted average exercise price, options (in dollars per share) | $ / shares	$ 14.85
Granted, options (in shares) | shares	223,825
Granted, weighted average exercise price, options (in dollars per share) | $ / shares	$ 2.93
Forfeited, options (in shares) | shares	(3,835)
Forfeited, weighted average exercise price, options (in dollars per share) | $ / shares	$ 16.15
Expired, options (in shares) | shares	(2,500)
Expired, weighted average exercise price, options (in dollars per share) | $ / shares	$ 18.46
Outstanding, options (in shares) | shares	321,868
Outstanding, weighted average exercise price, options (in dollars per share) | $ / shares	$ 6.52
Outstanding, weighted average remaining contractual life, options (Year)	6 years 109 days
Outstanding, aggregate intrinsic value, options | $	$ 129
Vested and Expected to Vest, options (in shares) | shares	285,743
Vested and Expected to Vest, weighted average exercise price, options (in dollars per share) | $ / shares	$ 6.88
Vested and Expected to Vest, weighted average remaining contractual life, options (Year)	6 years 73 days
Vested and Expected to Vest, aggregate intrinsic value, options | $	$ 111
Exercisable, options (in shares) | shares	157,553
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares	$ 9.58
Exercisable, weighted average remaining contractual life, options (Year)	5 years 328 days
Exercisable, aggregate intrinsic value, options | $	$ 49