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Note 5 - Derivative Instruments and Hedging Activities - Fair Value Adjustments of Forward Currency Forward Contracts Not Designated as Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Gain (loss) on settlement $ 381 $ 31 $ (60) $ 110
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]        
Gain (loss) on settlement   (39) (148) (78)
Gain (loss) on change in fair value   $ 70 $ 88 $ 188
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]        
Gain (loss) on settlement (55)      
Gain (loss) on change in fair value $ 436