Note 16 - Benefit Plans - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest cost	$ 2,401	$ 2,575	$ 2,688
Expected return on plan assets	(3,500)	(3,525)	(3,011)
Amortization of net loss	843	802	883
Loss on pension settlement	10,920	0	0
Net periodic pension cost (benefit)	$ 10,664	$ (148)	$ 560