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Note 5 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Mar. 31, 2019
Mar. 31, 2018
2020 $ 1,396  
2021 1,396  
2022 1,396  
2023 1,396  
2024 1,396  
Thereafter 1,919  
$ 8,899 $ 10,295