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Note 4 - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Operating Expense [Member]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ (88,441) $ (418,444) $ (460,830) $ (886,461)
Amount of Gain or (Loss) Recognized in Income on Derivative (ineffective Portion and Amount Excluded from Effectiveness), net of tax (8,741) (47,242) (31,323)
Cost of Sales [Member]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (36,075) (158,768) (142,891) (336,428)
Foreign currency forward contracts for the three months ended June 30, 2016 $ 106,631 $ 333,909 $ 990,151 $ (210,883)