Note 7 - Employee Benefit Plans (Details) - Net Periodic Pension Cost (Income) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Periodic Pension Cost (Income) [Abstract]
Service cost	$ 569	$ 993	$ 2,684	$ 2,980
Interest cost	422	1,017	2,361	3,051
Expected return on plan assets	(375)	(1,145)	(2,784)	(3,435)
Amortization of prior service cost	(171)	101	24	301
Amortization of net (gain) loss	660	706	2,212	2,119
Net periodic benefit cost	$ 1,105	$ 1,672	$ 4,497	$ 5,016