Note 4 - Summary of Stock Option Activity (Details) - The 2012 Stock Incentive Plan [Member] - $ / shares	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Shares Available For Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	414,975	424,612	448,544	352,185
Shares Available for Grant (in shares)			(352,185)
2012 Plan authorized (in shares)			500,000
Options granted (in shares)	35,208	43,643	61,382
Shares Available for Grant (in shares)	(35,208)	(43,643)	(61,382)
Options canceled (in shares)	(25,571)	(19,711)	(9,926)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	25,571	19,711	9,926
Balance (in shares)	54,307	75,388	88,728
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	431,800
Options granted (in shares)	35,208	43,643	61,382
Options granted (in dollars per share)	$ 13.97	$ 10.91	$ 8.77
Shares Available for Grant (in shares)	(35,208)	(43,643)	(61,382)
Options exercised (in shares)	(30,718)	(26,225)	(34,128)
Options exercised (in dollars per share)	$ 8.82	$ 9.83	$ 8.28
Options canceled (in shares)	(25,571)	(30,758)	(41,016)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	25,571	30,758	41,016