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Marketable Securities (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Gain (Loss) on Securities [Line Items]
Net realized gains to sales of marketable securities	$ 0		$ 85,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(3,735,000)	$ (5,279,000)	(13,297,000)
Proceeds from Equity Method Investment, Distribution, Return of Capital	313,000	324,000	587,000
Foreign Currency Translation [Abstract]
Marketable Securities, Unrealized Gain (Loss)	296,000	370,000	$ 727,000
Equity Method Investments
Foreign Currency Translation [Abstract]
Proceeds from Dividends Received	313,000	324,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investments	2,752,000	2,765,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Due from Related Parties, Current	5,083,000	4,133,000
Investment Income, Net	$ 365,000	212,000
EMC [Member] | EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
EMC [Member] | Equity Method Investments
Foreign Currency Translation [Abstract]
Foreign Currency Transaction Gain (Loss), Unrealized	$ 67,000	$ (163,000)

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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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