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Note 5 - Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating Expense [Member]        
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 432,021 (156,743) 560,971 (617,572)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (47,242)
Cost of Sales [Member]        
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion) (8,071) 73,091 222,881 1,063,242
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 66,121 (50,210) 90,991 (193,102)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)