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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Gain (loss) on settlement $ (63) $ 381 $ 190 $ (60)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]        
Gain (loss) on settlement   (55) 549 (148)
Gain (loss) on change in fair value   $ 436 $ (359) $ 88
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]        
Gain (loss) on settlement 129      
Gain (loss) on change in fair value $ (192)