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Note 6 - Other Comprehensive Income (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total $ 231,827 $ (260,469) $ (110,605) $ 492,900