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Note 7 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
May 31, 2020
Forward Contracts [Member]      
Derivative, Notional Amount $ 25.2 $ 31.8  
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative, Notional Amount $ 25.2 $ 26.8  
Forward Contracts [Member] | Minimum [Member]      
Derivative, Term of Contract (Month) 1 month    
Forward Contracts [Member] | Maximum [Member]      
Derivative, Term of Contract (Month) 18 months    
Interest Rate Swap [Member]      
Derivative, Notional Amount     $ 70.0