Note 7 - Derivative and Hedging Transactions - Effect of Hedge Accounting on the Consolidated Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	$ 3	$ (68)	$ (288)	$ (98)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component	0	0	0	0
Interest Income [Member] | Interest Rate Contract [Member]
Total amounts of income and expense line items presented in the consolidated statements of financial performance in which the effects of fair value or cash flow hedges are recorded	58	0	58	0
Hedged items	(179)	0	(179)	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0	0	0	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Amount of gain or (loss) reclassified from accumulated OCI into income - included component	0	0	0	0
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component	0	0	0	0
Interest Income [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments	236	0	236	0
Interest Expense [Member] | Interest Rate Contract [Member]
Total amounts of income and expense line items presented in the consolidated statements of financial performance in which the effects of fair value or cash flow hedges are recorded	(3)	68	288	98
Hedged items	0	0	0	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(3)	68	288	98
Amount of gain or (loss) reclassified from accumulated OCI into income - included component	(3)	68	288	98
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component	0	0	0	0
Interest Expense [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments	$ 0	$ 0	$ 0	$ 0