Note 3 - Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022	May 06, 2021
Goodwill	$ 43,471	$ 43,471
Neeltran Inc. [Member]
Cash and short-term investments		500
Net working capital (excluding inventory and deferred revenue)		(900)
Inventory		9,000
Property, plant and equipment		6,500
Deferred revenue		(10,000)
Deferred tax liability		2,300
Net tangible assets/(liabilities)		2,800
Net identifiable intangible assets/(liabilities)		4,800
Goodwill		8,800
Total purchase consideration		16,400
Neeltran Inc. [Member] \| Trademarks and Trade Names [Member]
Trade names and trademarks		1,200	$ 1,200
Neeltran Inc. [Member] \| Backlog [Member]
Finite-lived Intangibles Assets		100	100
Neeltran Inc. [Member] \| Customer Relationships [Member]
Finite-lived Intangibles Assets		$ 3,500	$ 3,500

Amount recognized as of the acquisition date for the net tangible assets (liabilities).

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Amount of net working capital recognized as of the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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