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Note 1 - Description of Business and Summary of Significant Accounting Policies - Estimated Useful Lives (Details)
12 Months Ended
Mar. 31, 2022
Building [Member]  
Property plant and equipment (Year) 40 years
Office Equipment [Member] | Maximum [Member]  
Property plant and equipment (Year) 7 years
Manufacturing Equipment [Member] | Maximum [Member]  
Property plant and equipment (Year) 7 years
Computer Equipment [Member] | Maximum [Member]  
Property plant and equipment (Year) 3 years