Note 6 - Pension and Post-Retirement Benefits - Net Periodic Costs (Details) (Pension Plan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Pension Plan [Member]
Service cost	$ 694	$ 716	$ 2,081	$ 2,139
Interest cost	1,673	1,746	5,085	5,197
Expected return on plan assets	(1,724)	(1,589)	(5,236)	(4,732)
Amortization of prior service cost		29		87
Amortization of net gain	7	2	23	8
	$ 650	$ 904	$ 1,953	$ 2,699