Note 6 - Pension and Post-retirement Benefits - Net Periodic Costs (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Service cost	$ 614	$ 715	$ 1,405	$ 1,429
Interest cost	1,533	1,759	3,085	3,527
Expected return on plan assets	(1,288)	(1,585)	(2,594)	(3,179)
Amortization of net loss	68	12	96	26
	$ 927	$ 901	$ 1,992	$ 1,803