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Note 4 - Inventories, Net - Summary of Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | --- | ---
Raw materials | $ 7,610 |  | $ 5,755
Work in process | 423 |  | 426
Finished goods | 4,084 |  | 4,997
Inventories, net | $ 12,117 | $ 11,178 | $ 11,178

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