Note 6 - Loans Receivable and Allowance for Loan Losses - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans receivable	$ 1,026,399	$ 965,044
Pass [Member]
Loans receivable	1,001,564	940,549
Special Mention [Member]
Loans receivable	1,587	1,994
Substandard [Member]
Loans receivable	21,819	21,072
Doubtful [Member]
Loans receivable	1,429	1,429
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	394,840	378,519
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans receivable	380,763	364,066
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	863	877
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans receivable	13,214	13,576
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member]
Loans receivable	78,636	61,453
Construction and Land Development Portfolio Segment [Member] | Pass [Member]
Loans receivable	78,636	61,453
Construction and Land Development Portfolio Segment [Member] | Special Mention [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member] | Substandard [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Commercial Portfolio Segment [Member]
Loans receivable	188,873	174,744
Commercial Portfolio Segment [Member] | Pass [Member]
Loans receivable	182,990	168,958
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	596	606
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans receivable	3,858	3,751
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	1,429	1,429
Owner Occupied Real Estate [Member]
Loans receivable	273,996	276,986
Owner Occupied Real Estate [Member] | Pass [Member]
Loans receivable	270,521	274,150
Owner Occupied Real Estate [Member] | Special Mention [Member]
Loans receivable		511
Owner Occupied Real Estate [Member] | Substandard [Member]
Loans receivable	3,475	2,325
Owner Occupied Real Estate [Member] | Doubtful [Member]
Loans receivable
Consumer Portfolio Segment [Member]
Loans receivable	67,402	63,660
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	66,130	62,370
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	1,272	1,290
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Residential Portfolio Segment [Member]
Loans receivable	22,652	9,682
Residential Portfolio Segment [Member] | Pass [Member]
Loans receivable	22,524	9,552
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	128
Residential Portfolio Segment [Member] | Substandard [Member]
Loans receivable		130
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans receivable