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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Forward Contracts [Member] | Designated as Hedging Instrument [Member]        
Derivative, Notional Amount $ 9,300,000 $ 20,400,000 $ 9,300,000 $ 20,400,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 28,977 100,000    
Derivative, Gain (Loss) on Derivative, Net     300,000 100,000
Forward Contracts [Member]        
Derivative, Notional Amount 11,000,000 24,000,000 11,000,000 24,000,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (21,008) $ (100,000)    
Derivative, Gain (Loss) on Derivative, Net     (100,000) $ (200,000)
Derivative, Notional Amount $ 10,955,000   $ 10,955,000