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Note 4 - Derivatives (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 30, 2022
USD ($)
Oct. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Interest Income (Expense), Operating $ 60,300 $ 67,084        
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]            
Derivative, Number of Instruments Held 12   12     12
Derivative Liability, Notional Amount $ 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%          
Commenced Fixed Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]            
Derivative, Fixed Interest Rate 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 $ (5,700) $ (4,300)        
Interest Rate Cap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Long [Member]            
Derivative Liability, Notional Amount     $ 225,000