Note 6 - Loans Receivable and Allowances for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
With no related allowance - Recorded investment	$ 16,589	$ 15,740
With no related allowance - Unpaid principal balance	18,159	17,298
With related allowance - Recorded investment	12,299	12,430
With related allowance - Unpaid principal balance	15,006	15,135
Related allowance	3,622	3,468
Recorded investment	28,888	28,170
Unpaid principal balance	33,165	32,433
Commercial Real Estate Portfolio Segment [Member]
With no related allowance - Recorded investment	12,234	12,347
With no related allowance - Unpaid principal balance	12,235	12,348
With related allowance - Recorded investment	6,620	6,898
With related allowance - Unpaid principal balance	6,634	6,912
Related allowance	1,305	1,277
Recorded investment	18,854	19,245
Unpaid principal balance	18,869	19,260
Construction and Land Development Portfolio Segment [Member]
With no related allowance - Recorded investment
With no related allowance - Unpaid principal balance
With 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	1,907	1,955
With no related allowance - Unpaid principal balance	3,067	3,111
With related allowance - Recorded investment	3,380	3,225
With related allowance - Unpaid principal balance	6,047	5,892
Related allowance	1,758	1,624
Recorded investment	5,287	5,180
Unpaid principal balance	9,114	9,003
Owner Occupied Real Estate [Member]
With no related allowance - Recorded investment	1,631	621
With no related allowance - Unpaid principal balance	1,742	733
With related allowance - Recorded investment	1,844	1,704
With related allowance - Unpaid principal balance	1,844	1,704
Related allowance	297	274
Recorded investment	3,475	2,325
Unpaid principal balance	3,586	2,437
Consumer Portfolio Segment [Member]
With no related allowance - Recorded investment	817	687
With no related allowance - Unpaid principal balance	1,115	976
With related allowance - Recorded investment	455	603
With related allowance - Unpaid principal balance	481	627
Related allowance	262	293
Recorded investment	1,272	1,290
Unpaid principal balance	1,596	1,603
Residential Portfolio Segment [Member]
With no related allowance - Recorded investment		130
With no related allowance - Unpaid principal balance		130
With related allowance - Recorded investment
With related allowance - Unpaid principal balance
Related allowance
Recorded investment		130
Unpaid principal balance		$ 130