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Note 5 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - Derivative Instruments [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Foreign currency forward contracts, asset $ (41)  
Foreign currency forward contracts, liability   $ (1,276)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Foreign currency forward contracts, asset (39)  
Foreign currency forward contracts, liability   (1,069)
Not Designated as Hedging Instrument [Member]    
Foreign currency forward contracts, asset $ (2)  
Foreign currency forward contracts, liability   $ (207)