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Note 6 - Derivative Instruments and Hedging Activities (Details Textual) - Foreign Exchange Forward [Member]
$ in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months $ 0   $ 0        
Designated as Hedging Instrument [Member]              
Derivative, Notional Amount 9,500   9,500   $ 11.7 $ 15,300 $ 19.5
Not Designated as Hedging Instrument [Member]              
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total $ (100) $ (100) $ (100) $ 200