Note 4 - Loans, Allowance for Loan Losses and Other Real Estate Owned - Impaired Loans, Supplemental Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Average Recorded Investment	$ 16,962	$ 22,084	$ 16,836	$ 23,428
Recognized Interest Income	208	372	819	1,132
Commercial Portfolio Segment [Member]
Average Recorded Investment	8,701	10,426	9,404	10,671
Recognized Interest Income	144	175	476	495
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	7,968	11,282	7,133	12,291
Recognized Interest Income	60	189	333	615
Residential Portfolio Segment [Member]
Average Recorded Investment	194	203	196	205
Recognized Interest Income	4	4	10	12
Consumer Portfolio Segment [Member]
Average Recorded Investment	99	173	103	261
Recognized Interest Income	$ 0	$ 4	$ 0	$ 10