Note 4 - Loans, Allowance for Loan Losses and Other Real Estate Owned - Impaired Loans, Supplemental Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Average Recorded Investment	$ 16,474	$ 22,985	$ 16,773	$ 24,100
Recognized Interest Income	294	363	611	760
Commercial Portfolio Segment [Member]
Average Recorded Investment	9,662	10,689	9,755	10,793
Recognized Interest Income	165	145	332	320
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	6,539	11,837	6,716	12,796
Recognized Interest Income	126	211	273	426
Residential Portfolio Segment [Member]
Average Recorded Investment	196	205	197	206
Recognized Interest Income	3	4	6	8
Consumer Portfolio Segment [Member]
Average Recorded Investment	77	254	105	305
Recognized Interest Income	$ 0	$ 3	$ 0	$ 6