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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivative, Notional Amount $ 20,249,559    
Forward Contracts [Member]      
Derivative, Notional Amount 20,200,000   $ 26,600,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 16,476 $ 100,000  
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative, Notional Amount 18,200,000   $ 24,000,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ 17,949 $ (200,000)