Note 8 - Leases - Components of Operating Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating lease cost	[1]	$ 2,046	$ 1,980
Less: Sublease income (Note 19)		(38)	(37)
Net lease cost		$ 2,008	$ 1,943

[1] Includes variable lease costs, which are immaterial.