Note 8 - Employee Benefit Plans (Details) - Net Periodic Pension Cost (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Periodic Pension Cost [Abstract]
Service cost	$ 4,025	$ 3,974	$ 3,877
Interest cost	3,889	4,069	4,114
Expected return on plan assets	(4,741)	(4,581)	(5,481)
Amortization of prior service cost	66	401	403
Amortization of net gain (loss) from earlier periods	3,152	2,826	880
Net periodic pension cost	$ 6,391	$ 6,688	$ 3,793