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Marketable Securities (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Gain (Loss) on Securities [Line Items]
Net realized gains to sales of marketable securities	$ 85,000	$ 50,000	$ 201,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (13,297,000)	8,010,000	2,097,000
Equity Method Investment, Ownership Percentage	49.00%
Proceeds from Equity Method Investment, Distribution, Return of Capital	$ 587,000	0	0
Unrealized Loss on Securities	727,000	143,000	$ 183,000
Equity Method Investments
Foreign Currency Translation [Abstract]
Proceeds from Dividends Received	1,290,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investments	3,040,000	3,402,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Due from Related Parties, Current	2,250,000	4,166,000
Investment Income, Net	715,000	$ 778,000
EMC [Member] | Equity Method Investments
Foreign Currency Translation [Abstract]
Foreign Currency Transaction Gain (Loss), Unrealized	$ 213,000

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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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