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Note 4 - Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Expense [Member]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 105,355 $ (372,390)
Amount of Gain or (Loss) Recognized in Income on Derivative (ineffective Portion and Amount Excluded from Effectiveness), net of tax   (47,240)
Cost of Sales [Member]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 21,128 (106,817)
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ 105,609 $ 883,520