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Note 5 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Sep. 30, 2021
Mar. 31, 2021
2022 $ 2,882  
2023 2,882  
2024 2,798  
2025 2,158  
2026 2,222  
Thereafter 4,541  
Finite-Lived Intangible Assets, Net, Ending Balance $ 17,483 $ 18,923