Note 11 - Retirement Benefits (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%	4.00%
Defined Contribution Plan, Cost	$ 0.2	$ 0.2