Note 4 - DERIVATIVES AND HEDGING ACTIVITIES - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Swapped loan portfolio loan-to-value percentage, including the potential swap exposure	65.00%
Interest rate swaps
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	$ 10,998	$ 38,756
Interest rate swaps | Cash
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	1,275	1,272
Interest rate swaps | Municipal securities.
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	3,945	8,227
Interest rate swaps | Residential mortgage-backed and related securities
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	$ 5,778	$ 29,257