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Note 5 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Forward Contracts [Member] | Designated as Hedging Instrument [Member]    
Derivative, Notional Amount $ 14,300,000 $ 16,500,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]    
Derivative, Gain (Loss) on Derivative, Net 200,000 (200,000)
Forward Contracts [Member]    
Derivative, Notional Amount 17,000,000 19,500,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (100,000) $ (100,000)
Derivative, Notional Amount $ 16,957,500