Note 23 - Derivatives and Risk Management Activities - Amounts Recorded in Statement of Financial Condition (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Assets [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Asset, Fair Value	$ 4	$ 5
Derivative Asset, Notional Amount	875	1,639
Other Assets [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Asset, Fair Value	2	10
Derivative Asset, Notional Amount	288	865
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Asset, Fair Value	362	410
Derivative Asset, Notional Amount	14,586	16,966
Other Liabilities [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Liability, Fair Value	133	138
Derivative Liability, Notional Amount	13,711	15,327
Other Liabilities [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Liability, Fair Value	83	230
Derivative Liability, Notional Amount	9,614	18,980
Other Liabilities [Member] | Interest Rate Lock Commitments [Member]
Derivative Liability, Fair Value
Derivative Liability, Notional Amount