Note 6 - Pension and Post-Retirement Benefits (Details) - Net Periodic Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Pension Plan [Member]
Note 6 - Pension and Post-Retirement Benefits (Details) - Net Periodic Costs [Line Items]
Service cost	$ 694	$ 709
Interest cost	1,690	1,715
Expected return on plan assets	(1,740)	(1,562)
Amortization of prior service cost (credit)		29
Amortization of net loss	7	3
Net periodic benefit costs	651	894
Postretirement Medical and Life Insurance Plan [Member]
Note 6 - Pension and Post-Retirement Benefits (Details) - Net Periodic Costs [Line Items]
Service cost	28	88
Interest cost	61	133
Amortization of prior service cost (credit)	(200)	(126)
Net periodic benefit costs	$ (111)	$ 95