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Marketable Securities (Narratives) (Details) - USD ($)	3 Months Ended		6 Months Ended
Marketable Securities (Narratives) (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	May 18, 2023	Mar. 31, 2023
Gain (Loss) on Securities [Line Items]
Marketable Securities, Realized Gain (Loss)	$ 0	$ 0	$ 0	$ 0
Unrealized Gain (Loss) on Investments	349,000	372,000	270,000	920,000
Proceeds from Equity Method Investment, Distribution, Return of Capital			144,000	313,000
Proceeds from Equity Method Investment, Distribution			247,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Increase (Decrease) in Accounts Receivable, Related Parties			5,833,000	5,083,000
Equity Method Investments	2,996,000		2,996,000			$ 2,752,000
Investment Income, Net	$ 183,000	$ 1,000	$ 559,000	$ 62,000
EMC [Member] \| EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investment, Ownership Percentage					49.00%