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Note 5 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Jun. 30, 2020
Mar. 31, 2020
2021 $ 2,882  
2022 2,882  
2023 2,882  
2024 2,882  
2025 2,275  
Thereafter 7,281  
Finite-Lived Intangible Assets, Net, Ending Balance $ 21,084 $ 21,703