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Note 5 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Foreign currency forward contracts $ (364)  
Derivative Instruments [Member]    
Foreign currency forward contracts (364)
Derivative Instruments [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Foreign currency forward contracts (321)
Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Foreign currency forward contracts $ (43)