Note 21 - Leases - Balance Sheet, Income Statement, and Cash Flow Detail Regarding Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Operating lease right-of-use asset	$ 11,720		$ 12,100
Operating lease liability	$ 13,062		$ 13,476
Weighted average remaining lease term (years) (Year)	8 years 4 months 24 days		8 years 7 months 6 days
Weighted average discount rate	3.38%		3.37%
One year or less	$ 2,091		$ 2,087
Year two	2,120		2,107
Year three	2,128		2,141
Year four	1,798		1,899
Year five	1,347		1,469
Greater than five years	5,580		5,882
Total lease payments	15,064		15,585
Less imputed interest	2,002		2,109
Total	13,062		$ 13,476
Operating lease cost	487	$ 470
Variable lease cost	51	42
Less sublease income	14	13
Total lease cost	524	499
Cash paid for operating lease liabilities	$ 520	$ 485