Note 20 - Leases - Balance Sheet, Income Statement, and Cash Flow Detail Regarding Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating lease right-of-use assets	$ 11,871		$ 12,737
Weighted average remaining lease term (Year)	9 years 1 month 6 days		9 years 4 months 24 days
Weighted average discount rate	3.50%		2.46%
One year or less	$ 1,469		$ 1,964
Year 2	1,915		1,915
Year 3	1,930		1,930
Year 4	1,972		1,972
Year 5	1,781		1,781
Greater than 5 years	6,619		6,619
Total lease payments	15,686		16,181
Less imputed interest	2,323		1,812
Components of lease expense:
Operating lease cost	470	$ 508
Variable lease cost	42	39
Less sublease income	13	14
Total lease cost	499	533
Supplemental cash flow information:
Cash paid for operating lease liabilities	393	$ 354
Other Liabilities [Member]
Operating lease liabilities	$ 13,363		$ 14,369