Note 5 - Allowances for Loan Losses - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans receivable	$ 2,658,142	$ 1,748,096
Pass [Member]
Loans receivable	2,644,105	1,733,406
Special Mention [Member]
Loans receivable	599	1,981
Substandard [Member]
Loans receivable	13,438	12,709
Doubtful [Member]
Loans receivable	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	705,748	613,631
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans receivable	701,151	609,382
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	80	90
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans receivable	4,517	4,159
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	0	0
Construction and Land Development Portfolio Segment [Member]
Loans receivable	142,821	121,395
Construction and Land Development Portfolio Segment [Member] | Pass [Member]
Loans receivable	142,821	121,395
Construction and Land Development Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	0	0
Construction and Land Development Portfolio Segment [Member] | Substandard [Member]
Loans receivable	0	0
Construction and Land Development Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member]
Loans receivable	200,188	223,906
Commercial Portfolio Segment [Member] | Pass [Member]
Loans receivable	197,225	220,819
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans receivable	2,963	3,087
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	0	0
Owner Occupied Real Estate [Member]
Loans receivable	475,206	424,400
Owner Occupied Real Estate [Member] | Pass [Member]
Loans receivable	470,732	418,997
Owner Occupied Real Estate [Member] | Special Mention [Member]
Loans receivable	519	1,770
Owner Occupied Real Estate [Member] | Substandard [Member]
Loans receivable	3,955	3,633
Owner Occupied Real Estate [Member] | Doubtful [Member]
Loans receivable	0	0
Consumer Portfolio Segment [Member]
Loans receivable	102,368	101,320
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	101,066	100,258
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	1,302	1,062
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	0	0
Residential Portfolio Segment [Member]
Loans receivable	395,174	263,444
Residential Portfolio Segment [Member] | Pass [Member]
Loans receivable	394,473	262,555
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	0	121
Residential Portfolio Segment [Member] | Substandard [Member]
Loans receivable	701	768
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans receivable	0	0
Paycheck Protection Program CARES Act [Member]
Loans receivable	636,637	0
Paycheck Protection Program CARES Act [Member] | Pass [Member]
Loans receivable	636,637	0
Paycheck Protection Program CARES Act [Member] | Special Mention [Member]
Loans receivable	0	0
Paycheck Protection Program CARES Act [Member] | Substandard [Member]
Loans receivable	0	0
Paycheck Protection Program CARES Act [Member] | Doubtful [Member]
Loans receivable	$ 0	$ 0