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Marketable Securities (Narratives) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 21, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | $ 0 |  | $ 0 |  |
Unrealized Gain on Securities | 148,000 |  | 341,000 |  |
EMC [Member] |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 49.00%
Increase (Decrease) in Accounts Receivable, Related Parties | 2,589,000 | $ 2,250,000 |  |  |
Equity Method Investments | 3,314,000 |  |  | $ 3,040,000 |
Investment Income, Net | $ 241,000 |  | $ 194,000 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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