Note 20 - Leases - Balance Sheet, Income Statement, and Cash Flow Detail Regarding Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating lease right-of-use assets	$ 11,208		$ 11,208		$ 12,737
Operating lease liabilities	$ 12,616		$ 12,616		$ 14,369
Weighted average remaining lease term (Year)	8 years 9 months 18 days		8 years 9 months 18 days		9 years 4 months 24 days
Weighted average discount rate	3.46%		3.46%		2.46%
One year or less	$ 1,914		$ 1,914
One year or less	1,919		1,919		$ 1,964
Year 2	1,968		1,968		1,915
Year 3	1,858		1,858		1,930
Year 4	1,496		1,496		1,972
Year 5					1,781
Greater than 5 years	5,540		5,540
Greater than 5 years					6,619
Total lease payments	14,695		14,695		16,181
Less imputed interest	2,079		2,079		1,812
Total lease liabilities	12,616		12,616		$ 14,369
Operating lease cost	468	$ 501	1,411	$ 1,498
Variable lease cost	44	38	131	101
Less sublease income	0	14	38	41
Total lease cost	$ 512	$ 525	1,504	1,558
Cash paid for operating lease liabilities			$ 1,186	$ 1,051