Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives of Intangible Assets (Details) |
12 Months Ended |
|---|---|
Mar. 31, 2020 | |
| Patents [Member] | |
| Patents (Year) | 20 years |
| Licensing Agreements [Member] | Minimum [Member] | |
| Patents (Year) | 8 years |
| Licensing Agreements [Member] | Maximum [Member] | |
| Patents (Year) | 14 years |
| X | ||||||||||
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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