Note 5 - Benefit Plans (Details) - Net Periodic Benefit Cost (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 Benefit Cost [Abstract]
Service cost	$ 140	$ 130	$ 421	$ 390
Interest cost	94	88	282	264
Expected return on plan assets	(99)	(87)	(297)	(261)
Amortization of net loss	62	41	185	123
Amortization of prior service cost	(2)	(2)	(6)	(6)
	$ 195	$ 170	$ 585	$ 510