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Note 5 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Jun. 30, 2021
Mar. 31, 2021
2022 $ 2,882  
2023 2,882  
2024 2,882  
2025 2,275  
2026 2,371  
Thereafter 4,911  
Finite-Lived Intangible Assets, Net, Ending Balance $ 18,203 $ 18,923