Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Non-accrual Loans (Details) - Business Activities Loans [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Non-accruing loans	$ 19,405	$ 19,186
Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans	12,393	3,525
Residential Portfolio Segment [Member]
Non-accruing loans	3,450	2,006
Commercial Portfolio Segment [Member]
Non-accruing loans	2,712	4,681
Consumer Portfolio Segment [Member]
Non-accruing loans	850	174
Construction Portfolio Segment [Member]
Non-accruing loans		8,800
Substandard [Member]
Non-accruing loans	19,405	19,186
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans	12,393	3,525
Substandard [Member] | Residential Portfolio Segment [Member]
Non-accruing loans	3,450	2,006
Substandard [Member] | Commercial Portfolio Segment [Member]
Non-accruing loans	2,712	4,681
Substandard [Member] | Consumer Portfolio Segment [Member]
Non-accruing loans	850	174
Substandard [Member] | Construction Portfolio Segment [Member]
Non-accruing loans		8,800
Substandard [Member] | Commercial and Industrial Portfolio Segment [Member]
Non-accruing loans		4,681
Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	7,082	18,384
Performing (accruing) loans, current	12,323	802
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	2,038	3,525
Performing (accruing) loans, current	10,355
Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	2,883	2,006
Performing (accruing) loans, current	567
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	1,987
Performing (accruing) loans, current	725
Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	174	97
Performing (accruing) loans, current	676	77
Substandard [Member] | Non-Accrual Loans [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due		8,800
Performing (accruing) loans, current
Substandard [Member] | Non-Accrual Loans [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due		3,956
Performing (accruing) loans, current		725
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	991	1,580
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	931	1,580
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	60
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	0
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	0
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	642	101
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	205
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	0
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	437
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due		86
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due		15
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	5,449	16,703
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	902	1,945
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	2,823	2,006
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	1,550
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	174	11
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due		8,800
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due		$ 3,941