Note 6 - Employee Benefit and Retirement Plans (Details) - Net Periodic Benefit Costs For Postretirement Medical Plan (Postretirement Medical and Life Insurance Plan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Postretirement Medical and Life Insurance Plan [Member]
Note 6 - Employee Benefit and Retirement Plans (Details) - Net Periodic Benefit Costs For Postretirement Medical Plan [Line Items]
Service cost	$ 88	$ 128
Interest cost	133	136
Amortization of prior service credit	(126)	(279)
Amortization of accumulated loss		40
	$ 95	$ 25