Note 7 - Employee Benefit Plans (Details) - Net Periodic Pension Cost (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Periodic Pension Cost [Abstract]
Service cost	$ 1,020	$ 1,057
Interest cost	1,186	970
Expected return on plan assets	(1,249)	(1,204)
Amortization of prior service cost (benefit)	(84)	97
Amortization of net loss	756	776
Net periodic benefit cost	$ 1,629	$ 1,696