Note 4 - Loans and Allowance for Loan Losses - Loans in Forbearance (Details) - Subsequent Event [Member] $ in Thousands	Apr. 29, 2020 USD ($)
Number of loans in forbearance	515
Amount of loans in forbearance	$ 142,882
Residential Portfolio Segment [Member] | Real Estate Sector [Member]
Number of loans in forbearance	170
Amount of loans in forbearance	$ 21,998
Commercial Portfolio Segment [Member] | Real Estate Sector [Member]
Number of loans in forbearance	98
Amount of loans in forbearance	$ 94,101
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Number of loans in forbearance	44
Amount of loans in forbearance	$ 13,119
Construction Portfolio Segment [Member] | Real Estate Sector [Member]
Number of loans in forbearance	1
Amount of loans in forbearance	$ 7,109
Consumer Portfolio Segment [Member]
Number of loans in forbearance	201
Amount of loans in forbearance	$ 4,051
Unallocated Financing Receivables [Member]
Number of loans in forbearance	1
Amount of loans in forbearance	$ 2,504