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Marketable Securities (Narratives) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 21, 2017
Gain (Loss) on Securities [Line Items]
Marketable Securities, Realized Gain (Loss)		$ 0		$ 0
Unrealized Gain on Securities	$ 37,000	$ 0	$ 174,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Equity Method Investment, Ownership Percentage					49.00%
Equity Method Investments	$ 3,759,000		3,759,000
Increase (Decrease) in Accounts Receivable, Related Parties			$ 5,220,000

X

- Definition

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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- Definition

The increase (decrease) during the reporting period in the amount due to the reporting entity for good and services provided to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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- Definition

Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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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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