Note 4 - Loans, Allowance for Loan Losses/Credit Losses and Other Real Estate Owned - Loans by Delinquency and Nonaccrual Status (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current and accruing	$ 1,304,707	$ 1,114,951
Nonaccrual	4,233	4,440
Total loans	1,316,359	1,126,664
Financial Asset, 30 to 59 Days Past Due [Member]
Past due and accruing	5,896	4,197
Financial Asset, 60 to 89 Days Past Due [Member]
Past due and accruing	1,233	2,636
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due and accruing	290	440
Commercial Portfolio Segment [Member]
Current and accruing	439,449	221,199
Nonaccrual	115	197
Total loans	439,793	222,085
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due and accruing	220	531
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due and accruing	9	158
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due and accruing	0	0
Commercial Real Estate Portfolio Segment [Member]
Current and accruing	564,554	573,809
Nonaccrual	3,835	4,096
Total loans	572,421	578,758
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due and accruing	3,675	432
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due and accruing	357	421
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due and accruing	0	0
Construction Portfolio Segment [Member]
Current and accruing	151	1,618
Nonaccrual	0	0
Total loans	151	1,618
Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due and accruing	0	0
Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due and accruing	0	0
Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due and accruing	0	0
Residential Portfolio Segment [Member]
Current and accruing	26,204	31,934
Nonaccrual	0	0
Total loans	27,147	32,748
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due and accruing	521	274
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due and accruing	422	540
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due and accruing	0	0
Consumer Portfolio Segment [Member]
Current and accruing	274,349	286,391
Nonaccrual	283	147
Total loans	276,847	291,455
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due and accruing	1,480	2,960
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due and accruing	445	1,517
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due and accruing	$ 290	$ 440