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Note 7 - Other Comprehensive Income (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total $ 48,073 $ 66,327 $ 31,806 $ (1,297,176)