Note 6 - Premises and Equipment- Balance Sheet, Income Statement, and Cash Flow Detail Regarding Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Right-of-use operating lease asset	$ 12,737	$ 0
Weighted average remaining lease term (Year)	9 years 4 months 17 days
Weighted average discount rate	2.46%
One year or less	$ 1,964
Year 2	1,915
Year 3	1,930
Year 4	1,972
Year 5	1,781
Greater than 5 years	6,619
Total lease payments	16,181
Less imputed interest	1,812
Operating lease cost	1,870
Variable lease cost	152
Less sublease income	54
Total lease cost	1,968
Operating cash flows from operating leases	1,656
Other Liabilities [Member]
Operating lease liability	$ 14,369