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Note 7 - Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ 1,208,606 $ (487,011) $ (377,460)
Operating Expense [Member]      
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (736,616) (1,870,818) (704,427)
Amount of Gain or (Loss) Recognized in Income on Derivative (ineffective Portion and Amount Excluded from Effectiveness), net of tax (47,242) (294,113) (20,535)
Cost of Sales [Member]      
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ (221,460) $ (525,916) $ (248,662)