Note 6 - Loans Receivable and Allowance for Loan Losses - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans receivable	$ 361,806	$ 329,567
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	887	7,956
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans receivable	13,773	12,203
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	376,466	349,726
Construction and Land Development Portfolio Segment [Member] | Pass [Member]
Loans receivable	48,927	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	56	117
Construction and Land Development Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member]
Loans receivable	48,983	46,547
Commercial Portfolio Segment [Member] | Pass [Member]
Loans receivable	180,836	176,132
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	56	225
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans receivable	3,805	4,064
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	1,429	1,429
Commercial Portfolio Segment [Member]
Loans receivable	186,126	181,850
Owner Occupied Real Estate [Member] | Pass [Member]
Loans receivable	265,904	242,560
Owner Occupied Real Estate [Member] | Special Mention [Member]
Loans receivable		469
Owner Occupied Real Estate [Member] | Substandard [Member]
Loans receivable	2,531	3,369
Owner Occupied Real Estate [Member] | Doubtful [Member]
Loans receivable
Owner Occupied Real Estate [Member]
Loans receivable	268,435	246,398
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	57,196	47,104
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable		75
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	1,384	947
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Consumer Portfolio Segment [Member]
Loans receivable	58,580	48,126
Residential Portfolio Segment [Member] | Pass [Member]
Loans receivable	6,909	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	6,909	2,380
Pass [Member]
Loans receivable	921,578	844,173
Special Mention [Member]
Loans receivable	943	8,725
Substandard [Member]
Loans receivable	21,549	20,700
Doubtful [Member]
Loans receivable	1,429	1,429
Loans receivable	$ 945,499	$ 875,027