Note 5 - Allowances for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
With no related allowance - Recorded investment	$ 12,862	$ 10,602
With no related allowance - Unpaid principal balance	13,599	14,850
With an related allowance - Recorded investment	6,020	7,428
With related allowance, Unpaid principal balance	6,571	8,555
Related allowance	556	1,473
Recorded investment	18,882	18,030
Unpaid principal balance	20,170	23,405
Commercial Real Estate Portfolio Segment [Member]
With no related allowance - Recorded investment	6,186	6,332
With no related allowance - Unpaid principal balance	6,192	6,337
With an related allowance - Recorded investment	4,145	4,615
With related allowance, Unpaid principal balance	4,667	5,498
Related allowance	265	295
Recorded investment	10,331	10,947
Unpaid principal balance	10,859	11,835
Construction and Land Development Portfolio Segment [Member]
With no related allowance - Recorded investment
With no related allowance - Unpaid principal balance
With an related allowance - Recorded investment
With related allowance, Unpaid principal balance
Related allowance
Recorded investment
Unpaid principal balance
Commercial Portfolio Segment [Member]
With no related allowance - Recorded investment	2,719	1,655
With no related allowance - Unpaid principal balance	2,989	5,418
With an related allowance - Recorded investment	368	2,007
With related allowance, Unpaid principal balance	383	2,195
Related allowance	23	867
Recorded investment	3,087	3,662
Unpaid principal balance	3,372	7,613
Owner Occupied Real Estate [Member]
With no related allowance - Recorded investment	2,127	1,905
With no related allowance - Unpaid principal balance	2,275	2,013
With an related allowance - Recorded investment	1,507	655
With related allowance, Unpaid principal balance	1,521	704
Related allowance	268	217
Recorded investment	3,634	2,560
Unpaid principal balance	3,796	2,717
Consumer Portfolio Segment [Member]
With no related allowance - Recorded investment	1,062	710
With no related allowance - Unpaid principal balance	1,375	1,082
With an related allowance - Recorded investment		151
With related allowance, Unpaid principal balance		158
Related allowance		94
Recorded investment	1,062	861
Unpaid principal balance	1,375	1,240
Residential Portfolio Segment [Member]
With no related allowance - Recorded investment	768
With no related allowance - Unpaid principal balance	768
With an related allowance - Recorded investment
With related allowance, Unpaid principal balance
Related allowance
Recorded investment	768
Unpaid principal balance	$ 768