Note 6 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Commercial Portfolio Segment [Member]
Collateral dependent loans, fair value	$ 775	$ 657
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0	0
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	0	0
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	$ 775	657
Commercial Real Estate Portfolio Segment [Member]
Collateral dependent loans, fair value		7,005
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value		0
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value		0
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value		$ 7,005