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Note 5 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
$ in Thousands
1 Months Ended
May 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Interest Rate Swap [Member]      
Derivative, Notional Amount $ 70,000 $ 70,000 $ 0
Forward Contracts [Member]      
Derivative, Notional Amount   41,400 30,500
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative, Notional Amount   $ 35,000 $ 26,100
Forward Contracts [Member] | Minimum [Member]      
Derivative, Term of Contract (Month) 1 month    
Forward Contracts [Member] | Maximum [Member]      
Derivative, Term of Contract (Month) 18 months