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Note 8 - Derivative Instruments and Hedging Activities (Details) - Forward Contracts [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 8 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Derivative, Notional Amount $ 24,000,000 $ 26,200,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (500,000) (300,000)
Designated as Hedging Instrument [Member]    
Note 8 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Derivative, Notional Amount 20,300,000 22,300,000
Not Designated as Hedging Instrument [Member]    
Note 8 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Derivative, Gain (Loss) on Derivative, Net $ (100,000) $ 50,000