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Investments in Securities and Fair Value (Schedule of Carrying Value and Fair Value of Financial Assets Disclosed) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | $ 41,534 | $ 25,949 |
Accrued interest and dividends | 1,187 | 1,033 |
Equity Securities, Estimated Fair Value | 58,851 | 61,108 |
Money market funds, Treasury bills and certificates of deposit | 22,516 | 13,134 |
Equity investments in unconsolidated affiliates, equity method | 6,541 | 6,083 |
Equity investments in unconsolidated affiliates, measurement alternative | 8,288 | 7,899 | $ 6,589
Assets, fair value disclosure | 138,917 | 115,206 |
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 41,534 | 25,949 |
Accrued interest and dividends | 1,187 | 1,033 |
Equity Securities, Estimated Fair Value | 58,851 | 61,108 |
Money market funds, Treasury bills and certificates of deposit | 22,516 | 13,134 |
Equity investments in unconsolidated affiliates, equity method | 0 | 0 |
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0 |
Assets, fair value disclosure | 124,088 | 101,224 |
Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 0 | 0 |
Accrued interest and dividends | 0 | 0 |
Equity Securities, Estimated Fair Value | 0 | 0 |
Money market funds, Treasury bills and certificates of deposit | 0 | 0 |
Equity investments in unconsolidated affiliates, equity method | 0 | 0 |
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0 |
Assets, fair value disclosure | 0 | 0 |
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 0 | 0 |
Accrued interest and dividends | 0 | 0 |
Equity Securities, Estimated Fair Value | 0 | 0 |
Money market funds, Treasury bills and certificates of deposit | 0 | 0 |
Equity investments in unconsolidated affiliates, equity method | 6,541 | 6,083 |
Equity investments in unconsolidated affiliates, measurement alternative | 8,288 | 7,899 |
Assets, fair value disclosure | $ 14,829 | $ 13,982 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117311354&loc=d3e32014-111567 + Details
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