Note 6 - Derivatives - Schedule of Fair Value Hedges Cumulative-basis Adjustment (Details) - Designated as Hedging Instrument [Member] - Fair Value Hedging [Member] - Securities Investment [Member] - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Cumulative Amount of Fair Value Hedging Adjustment	[1]	$ 6,016	$ 4,107
Reported Value Measurement [Member]
Hedged Assets	[1]	$ 53,984	$ 55,893

[1] These amounts include the amortized cost basis of closed portfolios used in designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At September 30, 2023, the amortized cost basis of the closed portfolios used in these hedging relationships was $237.8 million; the cumulative basis adjustments associated with these hedging relationships was $6.0 million; and the amounts of the designated hedged items was $60.0 million.