Note 23 - Segment Information - Total Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets, Total	$ 2,523,366	$ 2,693,802	$ 2,760,727
Cash and Other Investments	44,013	93,236
Deferred Tax Assets	68,821	103,505
Operating Segments [Member] | Reportable Segments [Member]
Assets, Total	1,973,225	2,069,279
Operating Segments [Member] | All Other Segment [Member]
Assets, Total	$ 437,307	$ 427,782