Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Collateral dependent loans, fair value	$ 0	$ 0
Collateral dependent loans, gain (loss)	4	0
Other real estate owned, fair value	0	0
Other real estate owned, gain (loss)	0	0
Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0	0
Other real estate owned, fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	7,632	13,561
Other real estate owned, fair value	10	10
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	7,632	13,561
Other real estate owned, fair value	$ 10	$ 10