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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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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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