Note 7 - Supplemental Balance Sheets Information - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Land	$ 889	$ 889
Buildings	21,537	18,857
Manufacturing equipment	17,336	12,163
Computer equipment	4,519	4,350
Construction in progress	487	985
Other	1,578	1,084
Gross total	46,346	38,328
Accumulated depreciation	(17,726)	(16,330)
Property, plant and equipment, net	$ 28,620	$ 21,998

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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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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