Note 3 - Loans - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020
Loans, net of deferred fees and costs	$ 1,940,332		$ 2,015,056
90 days past due and still accruing	0		262
Nonaccrual loans	1,903		2,434
Loans and Leases Receivable, Net of Deferred Income, Total	1,940,332		2,015,056
Financial Asset, 30 to 59 Days Past Due [Member]
Loans, net of deferred fees and costs	542		1,143
Loans and Leases Receivable, Net of Deferred Income, Total	542		1,143
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, net of deferred fees and costs	68		234
Loans and Leases Receivable, Net of Deferred Income, Total	68		234
Financial Asset, Past Due [Member]
Loans, net of deferred fees and costs	2,513		4,073
Loans and Leases Receivable, Net of Deferred Income, Total	2,513		4,073
Financial Asset, Not Past Due [Member]
Loans, net of deferred fees and costs	1,937,819		2,010,983
Loans and Leases Receivable, Net of Deferred Income, Total	1,937,819		2,010,983
Commercial Portfolio Segment [Member]
Loans, net of deferred fees and costs	320,278	[1]	491,256
90 days past due and still accruing	0		0
Nonaccrual loans	32		100
Loans and Leases Receivable, Net of Deferred Income, Total	320,278	[1]	491,256
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, net of deferred fees and costs	51		153
Loans and Leases Receivable, Net of Deferred Income, Total	51		153
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, net of deferred fees and costs	0		9
Loans and Leases Receivable, Net of Deferred Income, Total	0		9
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans, net of deferred fees and costs	83		262
Loans and Leases Receivable, Net of Deferred Income, Total	83		262
Commercial Real Estate Portfolio Segment [Member] | Construction and Land Development [Member]
Loans, net of deferred fees and costs	120,193		140,071
90 days past due and still accruing	0		0
Nonaccrual loans	1		5
Loans and Leases Receivable, Net of Deferred Income, Total	120,193		140,071
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	404,029		373,680
90 days past due and still accruing	0		209
Nonaccrual loans	23		304
Loans and Leases Receivable, Net of Deferred Income, Total	404,029		373,680
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	713,339		627,569
90 days past due and still accruing	0		0
Nonaccrual loans	926		1,158
Loans and Leases Receivable, Net of Deferred Income, Total	713,339		627,569
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Construction and Land Development [Member]
Loans, net of deferred fees and costs	0		168
Loans and Leases Receivable, Net of Deferred Income, Total	0		168
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	0		62
Loans and Leases Receivable, Net of Deferred Income, Total	0		62
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	0		0
Loans and Leases Receivable, Net of Deferred Income, Total	0		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Construction and Land Development [Member]
Loans, net of deferred fees and costs	0		0
Loans and Leases Receivable, Net of Deferred Income, Total	0		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	0		0
Loans and Leases Receivable, Net of Deferred Income, Total	0		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	0		0
Loans and Leases Receivable, Net of Deferred Income, Total	0		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Construction and Land Development [Member]
Loans, net of deferred fees and costs	1		173
Loans and Leases Receivable, Net of Deferred Income, Total	1		173
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	23		575
Loans and Leases Receivable, Net of Deferred Income, Total	23		575
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	926		1,158
Loans and Leases Receivable, Net of Deferred Income, Total	926		1,158
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Construction and Land Development [Member]
Loans, net of deferred fees and costs	120,192		139,898
Loans and Leases Receivable, Net of Deferred Income, Total	120,192		139,898
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	404,006		373,105
Loans and Leases Receivable, Net of Deferred Income, Total	404,006		373,105
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	712,413		626,411
Loans and Leases Receivable, Net of Deferred Income, Total	712,413		626,411
Residential Portfolio Segment [Member]
Loans, net of deferred fees and costs	375,668		374,018
Loans and Leases Receivable, Net of Deferred Income, Total	375,668		374,018
Residential Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans, net of deferred fees and costs	713,339		627,569
Loans and Leases Receivable, Net of Deferred Income, Total	713,339		627,569
Residential Portfolio Segment [Member] | Residential [Member]
Loans, net of deferred fees and costs	280,351		269,137
90 days past due and still accruing	0		53
Nonaccrual loans	827		792
Loans and Leases Receivable, Net of Deferred Income, Total	280,351		269,137
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Loans, net of deferred fees and costs	95,317		104,881
90 days past due and still accruing	0		0
Nonaccrual loans	81		69
Loans and Leases Receivable, Net of Deferred Income, Total	95,317		104,881
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential [Member]
Loans, net of deferred fees and costs	409		711
Loans and Leases Receivable, Net of Deferred Income, Total	409		711
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member]
Loans, net of deferred fees and costs	81		0
Loans and Leases Receivable, Net of Deferred Income, Total	81		0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential [Member]
Loans, net of deferred fees and costs	0		211
Loans and Leases Receivable, Net of Deferred Income, Total	0		211
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member]
Loans, net of deferred fees and costs	55		0
Loans and Leases Receivable, Net of Deferred Income, Total	55		0
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Residential [Member]
Loans, net of deferred fees and costs	1,236		1,767
Loans and Leases Receivable, Net of Deferred Income, Total	1,236		1,767
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Home Equity Line of Credit [Member]
Loans, net of deferred fees and costs	217		69
Loans and Leases Receivable, Net of Deferred Income, Total	217		69
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Residential [Member]
Loans, net of deferred fees and costs	279,115		267,370
Loans and Leases Receivable, Net of Deferred Income, Total	279,115		267,370
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Home Equity Line of Credit [Member]
Loans, net of deferred fees and costs	95,100		104,812
Loans and Leases Receivable, Net of Deferred Income, Total	95,100		104,812
Consumer Portfolio Segment [Member]
Loans, net of deferred fees and costs	6,825		8,462
90 days past due and still accruing	0		0
Nonaccrual loans	13		6
Loans and Leases Receivable, Net of Deferred Income, Total	6,825		8,462
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, net of deferred fees and costs	1		49
Loans and Leases Receivable, Net of Deferred Income, Total	1		49
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, net of deferred fees and costs	13		14
Loans and Leases Receivable, Net of Deferred Income, Total	13		14
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans, net of deferred fees and costs	27		69
Loans and Leases Receivable, Net of Deferred Income, Total	27		69
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans, net of deferred fees and costs	6,798		8,393
Loans and Leases Receivable, Net of Deferred Income, Total	$ 6,798		$ 8,393

[1] Includes PPP loans, which are guaranteed by the SBA and have no related allowance.