Note 4 - Summary of Stock Option Activity (Details) - The 2012 Stock Incentive Plan [Member] - $ / shares	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Shares Available For Grant [Member]
Shares Available for Grant (in shares)	414,975	424,612	448,544
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	52,836	35,208	43,643
Shares Available for Grant (in shares)	(52,836)	(35,208)	(43,643)
Options canceled (in shares)	(27,705)	(25,571)	(19,711)
Shares Available for Grant (in shares)	27,705	25,571	19,711
Shares Available for Grant (in shares)	389,844	414,975	424,612
Balance (in shares)	54,307	75,388	88,728
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	52,836	35,208	43,643
Options granted (in dollars per share)	$ 9.37	$ 13.97	$ 10.91
Shares Available for Grant (in shares)	(52,836)	(35,208)	(43,643)
Options exercised (in shares)	(15,523)	(30,718)	(26,225)
Options exercised (in dollars per share)	$ 9.57	$ 8.82	$ 9.83
Options canceled (in shares)	(27,705)	(25,571)	(30,758)
Shares Available for Grant (in shares)	27,705	25,571	30,758
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	54,307	75,388	88,728
Shares Available for Grant (in shares)	391,600
Balance (in shares)	63,915	54,307	75,388