Marketable Securities (Narratives) (Details) - USD ($)	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Securities [Line Items]
Net realized gains to sales of marketable securities	$ 0	$ 85,000	$ 50,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (5,279,000)	(13,297,000)	8,010,000
Equity Method Investment, Ownership Percentage	49.00%
Proceeds from Equity Method Investment, Distribution, Return of Capital	$ 324,000	587,000	0
Unrealized Loss on Securities	370,000		$ 143,000
Foreign Currency Translation [Abstract]
Unrealized Gain on Securities		727,000
Equity Method Investments
Foreign Currency Translation [Abstract]
Proceeds from Dividends Received	324,000	1,290,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investments	2,765,000	3,040,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Due from Related Parties, Current	4,133,000	2,250,000
Investment Income, Net	212,000	715,000
EMC [Member] \| Equity Method Investments
Foreign Currency Translation [Abstract]
Foreign Currency Transaction Gain (Loss), Unrealized	$ 163,000	$ (213,000)

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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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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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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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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The increase (decrease), resulting in a gain, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

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