Note 6 - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans receivable	$ 355,084	$ 329,567
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	898	7,956
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans receivable	13,802	12,203
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	369,784	349,726
Construction and Land Development Portfolio Segment [Member] | Pass [Member]
Loans receivable	40,402	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	60	117
Construction and Land Development Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member]
Loans receivable	40,462	46,547
Commercial Portfolio Segment [Member] | Pass [Member]
Loans receivable	193,796	176,132
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	60	225
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans receivable	3,864	4,064
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	1,429	1,429
Commercial Portfolio Segment [Member]
Loans receivable	199,149	181,850
Owner Occupied Real Estate [Member] | Pass [Member]
Loans receivable	262,997	242,560
Owner Occupied Real Estate [Member] | Special Mention [Member]
Loans receivable		469
Owner Occupied Real Estate [Member] | Substandard [Member]
Loans receivable	2,248	3,369
Owner Occupied Real Estate [Member] | Doubtful [Member]
Loans receivable
Owner Occupied Real Estate [Member]
Loans receivable	265,245	246,398
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	52,065	47,104
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable		75
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	1,148	947
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Consumer Portfolio Segment [Member]
Loans receivable	53,213	48,126
Residential Portfolio Segment [Member] | Pass [Member]
Loans receivable	2,338	2,380
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans receivable
Residential Portfolio Segment [Member] | Substandard [Member]
Loans receivable
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Residential Portfolio Segment [Member]
Loans receivable	2,338	2,380
Pass [Member]
Loans receivable	906,682	844,173
Special Mention [Member]
Loans receivable	958	8,725
Substandard [Member]
Loans receivable	21,122	20,700
Doubtful [Member]
Loans receivable	1,429	1,429
Loans receivable	$ 930,191	$ 875,027