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Note 5 - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating Expense [Member]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ (372,390) $ (468,016)
Amount of Gain or (Loss) Recognized in Income on Derivative (ineffective Portion and Amount Excluded from Effectiveness), net of tax (47,240) (23,928)
Cost of Sales [Member]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (106,817) (177,660)
Foreign currency forward contracts for the three months ended March 31, 2016 $ 883,520 $ (544,792)