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Note 5 - Derivatives (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2022 USD ($)	Oct. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Interest Income (Expense), Operating	$ 60,887	$ 62,357	$ 182,626	$ 193,284
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative, Number of Instruments Held	12		12		12			12
Derivative Liability, Notional Amount	$ 550,000		$ 550,000		$ 550,000			$ 550,000
Commenced Fixed Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]
Derivative, Fixed Interest Rate	0.63%		0.63%
Commenced Fixed Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]
Derivative, Fixed Interest Rate	3.72%		3.72%
Interest Rate Cap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative, Number of Instruments Held							2
Derivative Liability, Notional Amount						$ 75,000	$ 150,000
Interest Income (Expense), Operating	$ 5,600	$ 5,500	$ 16,900	$ 14,600
Interest Rate Cap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Long [Member]
Derivative Liability, Notional Amount					$ 225,000

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