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Note 4 - Supplemental Balance Sheets Information - Summary of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Raw materials	$ 13,962	$ 5,755
Work in process	1,956	426
Finished goods	7,801	4,997
Inventories, net	$ 23,719	$ 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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