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Marketable Securities and Other Investments (Details) - USD ($)	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Gain (Loss) on Securities [Line Items]
Unrealized gain (loss) on investments	$ 317,000	$ (296,000)	$ (370,000)
Debt and equity securities, realized gain	212,000	0	0
Dividend received from equity method investment	144,000	313,000	$ 324,000
Accounts receivable	171,186,000	151,451,000
Related Party | EMC
Gain (Loss) on Securities [Line Items]
Accounts receivable	$ 10,300,000	$ 5,083,000
EMC
Gain (Loss) on Securities [Line Items]
Equity method investment, ownership percentage	49.00%	49.00%
Equity method investments	$ 3,377,000	$ 2,752,000
Investment income, net	890,000	365,000
Foreign currency transaction gain (loss), unrealized	(18,000)	(67,000)
Dividend received from equity method investment	$ 247,000	$ 313,000

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