The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The increase (decrease) during the reporting period in the amount due to the reporting entity for good and services provided to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Dividends received on equity and other investments during the current period.

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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unrealized gain (loss) on investment.

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Marketable Securities (Narratives) (Details) - USD ($)	3 Months Ended
Marketable Securities (Narratives) (Details) - USD ($)	Jun. 30, 2023	Jun. 30, 2022	May 18, 2023	Mar. 31, 2023
Gain (Loss) on Securities [Line Items]
Marketable Securities, Realized Gain (Loss)	$ 0	$ 0
Unrealized Gain (Loss) on Investments	80,000	548,000
Proceeds from Equity Method Investment, Distribution, Return of Capital	0	313,000
Equity Method Investments [Member]
Gain (Loss) on Securities [Line Items]
Proceeds from Dividends Received		313,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Increase (Decrease) in Accounts Receivable, Related Parties	5,875,000	5,083,000
Equity Method Investments	3,158,000			$ 2,752,000
Investment Income, Net	$ 388,000	$ 65,000
EMC [Member] \| EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investment, Ownership Percentage			49.00%