Note 6 - Net Periodic Costs (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Service cost	$ 714	$ 694	$ 2,143	$ 2,081
Interest cost	1,732	1,673	5,259	5,085
Expected return on plan assets	(1,560)	(1,724)	(4,739)	(5,236)
Amortization of net loss	13	7	39	23
	$ 899	$ 650	$ 2,702	$ 1,953