Note 5 - DERIVATIVES AND HEDGING ACTIVITIES - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
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	$ 109,525	$ 150,102
Interest rate swaps | Cash
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	14,470	51,680
Interest rate swaps | U.S treasuries and govt. sponsored agency securities
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	6,285	6,413
Interest rate swaps | Municipal securities.
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	67,040	68,651
Interest rate swaps | Residential mortgage-backed and related securities
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	$ 21,730	$ 23,358