Note 7 - Derivative Financial Instruments - Derivative Instruments, Gain (Loss) (Details) - Interest Rate Swap [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Hedged items	$ 14	$ 21	$ (3)	$ 21
Interest rate contracts designated as hedging instruments	118	208	343	565
Net gain on fair value hedging relationships included in interest income from investment securities - taxable	$ 132	$ 229	$ 340	$ 586