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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Property, Plant and Equipment, Useful Life [Table Text Block]

Category

Useful Lives

Buildings / Building improvements40 (years or less)
Office equipment7 (years or less)

Manufacturing equipment 

7 (years or less)

Computer equipment 

3 (years or less)
Leasehold Improvements Lesser of the economic life or the remaining term in the respective lease