Note 4 - Credit Quality - Collateral Dependent Loans (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Collateral dependent loans	$ 2,992
Collateral coverage	$ 2,992
Collateral coverage percentage	100.00%
Commercial Real Estate, Hotel 1 [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Commercial Real Estate, Office [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Commercial Real Estate, Other [Member]
Collateral dependent loans	$ 2,769
Collateral coverage	$ 2,769
Collateral coverage percentage	100.00%
Commercial Real Estate, Retail [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Multi-family, Industrial [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Multi-family, Office [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Multi-family, Other [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Commercial and Industrial, Industrial [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Commercial and Industrial, Other [Member]
Collateral dependent loans	$ 0
Collateral coverage	$ 0
Collateral coverage percentage	0.00%
Consumer Owner Occupied, Other [Member]
Collateral dependent loans	$ 40
Collateral coverage	$ 40
Collateral coverage percentage	100.00%
Consumer, Other [Member]
Collateral dependent loans	$ 183
Collateral coverage	$ 183
Collateral coverage percentage	100.00%