Note 5 - Allowances for Loan Losses - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans receivable	$ 1,748,096	$ 1,436,614
Pass [Member]
Loans receivable	1,733,406	1,422,542
Special Mention [Member]
Loans receivable	1,981	2,358
Substandard [Member]
Loans receivable	12,709	11,434
Doubtful [Member]
Loans receivable		280
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	613,631	515,738
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans receivable	609,382	510,186
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	90	921
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans receivable	4,159	4,631
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Construction and Land Development Portfolio Segment [Member]
Loans receivable	121,395	121,042
Construction and Land Development Portfolio Segment [Member] | Pass [Member]
Loans receivable	121,395	121,042
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	223,906	200,423
Commercial Portfolio Segment [Member] | Pass [Member]
Loans receivable	220,819	196,751
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans receivable		10
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans receivable	3,087	3,382
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans receivable		280
Owner Occupied Real Estate [Member]
Loans receivable	424,400	367,895
Owner Occupied Real Estate [Member] | Pass [Member]
Loans receivable	418,997	364,032
Owner Occupied Real Estate [Member] | Special Mention [Member]
Loans receivable	1,770	1,303
Owner Occupied Real Estate [Member] | Substandard [Member]
Loans receivable	3,633	2,560
Owner Occupied Real Estate [Member] | Doubtful [Member]
Loans receivable
Consumer Portfolio Segment [Member]
Loans receivable	101,320	91,152
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	100,258	90,291
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	1,062	861
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans receivable
Residential Portfolio Segment [Member]
Loans receivable	263,444	140,364
Residential Portfolio Segment [Member] | Pass [Member]
Loans receivable	262,555	140,240
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	121	124
Residential Portfolio Segment [Member] | Substandard [Member]
Loans receivable	768
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans receivable