Note 14 - Benefit Plans - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest cost	$ 2,747	$ 2,681	$ 2,591
Expected return on plan assets	(2,868)	(3,041)	(2,933)
Amortization of net loss	941	1,228	106
Net periodic pension (benefit) cost	$ 820	$ 868	$ (236)