Note 7 - Supplemental Balance Sheets Information - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Land	$ 889	$ 889
Buildings and building improvements	22,005	21,537
Manufacturing equipment	14,481	17,336
Computer equipment	4,413	4,519
Other	4,394	1,578
Construction in progress	1,735	487
Gross total	47,917	46,346
Accumulated depreciation	(19,768)	(17,726)
Property, plant and equipment, net	28,149	28,620
Depreciation, Total	4,313	3,262	$ 2,959
Cost of Sales [Member]
Depreciation, Total	3,163	2,243	1,859
Operating Expense [Member]
Depreciation, Total	$ 1,150	$ 1,019	$ 1,100

Amount before accumulated depreciation of manufacturing equipment used to produce goods and services.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.

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