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Note 5 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
May 31, 2020
Interest Rate Swap [Member]      
Derivative, Notional Amount $ 70.0 $ 70.0 $ 70.0
Forward Contracts [Member]      
Derivative, Notional Amount 30.9 25.2  
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative, Notional Amount $ 30.9 $ 25.2  
Forward Contracts [Member] | Minimum [Member]      
Derivative, Term of Contract (Month) 1 month