Note 4 - Loans - Credit Risk Profile (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable, Net of Deferred Income, Total	$ 2,101,711	$ 1,830,815
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	566,859	339,077
Commercial Portfolio Segment [Member] | Pass [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	559,180	328,488
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	6,604	8,710
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	1,025	1,144
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	50	735
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	1,120,160	1,037,119
Commercial Real Estate Portfolio Segment [Member] | Construction and Land Development [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	141,392	137,920
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	978,768	899,199
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction and Land Development [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	135,124	130,694
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	942,737	860,615
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction and Land Development [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	3,014	4,133
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	16,370	22,117
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction and Land Development [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	3,254	3,093
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	19,661	16,467
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Construction and Land Development [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	405,639	443,738
Residential Portfolio Segment [Member] | Residential [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	291,242	324,315
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	114,397	119,423
Residential Portfolio Segment [Member] | Pass [Member] | Residential [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	283,239	316,454
Residential Portfolio Segment [Member] | Pass [Member] | Home Equity Line of Credit [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	113,882	118,960
Residential Portfolio Segment [Member] | Special Mention [Member] | Residential [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	4,586	4,370
Residential Portfolio Segment [Member] | Special Mention [Member] | Home Equity Line of Credit [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Residential Portfolio Segment [Member] | Substandard [Member] | Residential [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	3,417	3,491
Residential Portfolio Segment [Member] | Substandard [Member] | Home Equity Line of Credit [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	515	463
Residential Portfolio Segment [Member] | Doubtful [Member] | Residential [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Residential Portfolio Segment [Member] | Doubtful [Member] | Home Equity Line of Credit [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	9,053	10,881
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	9,052	10,877
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	$ 1	$ 4