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Note 5 - Goodwill and Intangible Assets, Net (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Amortization of Intangible Assets, Total $ 3,828 $ 2,565 $ 10,694 $ 5,895