Note 14 - Leases - Maturity Analysis of Operating Lease Liability Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Within one year	$ 6,521		$ 6,962
One to three years	11,804		11,806
Three to five years	10,529		10,106
More than five years	77,596		72,030
Total undiscounted cash flows	106,450		100,904
Discount on cash flows	(33,481)		(31,258)
Operating Lease, Liability, Total	$ 72,969	$ 68,856	$ 69,646