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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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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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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Amount of unrealized gain (loss) on investment.

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Marketable Securities (Narratives) (Details) - USD ($)	3 Months Ended			9 Months Ended
Marketable Securities (Narratives) (Details) - USD ($)	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021	Dec. 21, 2017
Gain (Loss) on Securities [Line Items]
Marketable Securities, Realized Gain (Loss)	$ 0		$ 0	$ 0	$ 0
Unrealized Gain (Loss) on Investments	145,000		195,000	214,000	682,000
Proceeds from Equity Method Investment, Distribution, Return of Capital				324,000	587,000
Equity Method Investments [Member]
Gain (Loss) on Securities [Line Items]
Proceeds from Dividends Received				324,000	1,290,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investment, Ownership Percentage							49.00%
Increase (Decrease) in Accounts Receivable, Related Parties		$ 2,250,000		2,266,000
Equity Method Investments	2,775,000			2,775,000		$ 3,040,000
Investment Income, Net	$ (218,000)		$ 173,000	$ 157,000	$ 560,000