Note 5 - Allowance for Loan Losses - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans receivable	$ 965,044	$ 875,027
Pass [Member]
Loans receivable	940,549	844,173
Special Mention [Member]
Loans receivable	1,994	8,725
Substandard [Member]
Loans receivable	21,072	20,700
Doubtful [Member]
Loans receivable	1,429	1,429
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	378,519	349,726
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans receivable	364,066	329,567
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	877	7,956
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans receivable	13,576	12,203
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member]
Loans receivable	61,453	46,547
Construction and Land Development Portfolio Segment [Member] | Pass [Member]
Loans receivable	61,453	46,430
Construction and Land Development Portfolio Segment [Member] | Special Mention [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member] | Substandard [Member]
Loans receivable		117
Construction and Land Development Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Commercial Portfolio Segment [Member]
Loans receivable	174,744	181,850
Commercial Portfolio Segment [Member] | Pass [Member]
Loans receivable	168,958	176,132
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	606	225
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans receivable	3,751	4,064
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	1,429	1,429
Owner Occupied Real Estate [Member]
Loans receivable	276,986	246,398
Owner Occupied Real Estate [Member] | Pass [Member]
Loans receivable	274,150	242,560
Owner Occupied Real Estate [Member] | Special Mention [Member]
Loans receivable	511	469
Owner Occupied Real Estate [Member] | Substandard [Member]
Loans receivable	2,325	3,369
Owner Occupied Real Estate [Member] | Doubtful [Member]
Loans receivable
Consumer Portfolio Segment [Member]
Loans receivable	63,660	48,126
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	62,370	47,104
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable		75
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	1,290	947
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Residential Portfolio Segment [Member]
Loans receivable	9,682	2,380
Residential Portfolio Segment [Member] | Pass [Member]
Loans receivable	9,552	2,380
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans receivable
Residential Portfolio Segment [Member] | Substandard [Member]
Loans receivable	130
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans receivable