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Investments in Securities and Fair Value Investments in Securities (Schedule of Gross Unrealized Gains and Losses and Amortized Cost for Securities) (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Government obligations |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | $ 24,026 | $ 25,161
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 57 | 6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 4
Available-for-sale, at fair value, Estimated Fair Value | 24,083 | 25,163
General obligations of U.S. states, territories and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | 17,391 | 18,887
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,262 | 843
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale, at fair value, Estimated Fair Value | 18,653 | 19,730
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | 44,939 | 51,188
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3,270 | 2,530
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3 | 20
Available-for-sale, at fair value, Estimated Fair Value | $ 48,206 | $ 53,698
Number of Special Revenue Bonds | 50 | 50
Corporate debt securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | $ 25,681 | $ 5,431
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,114 | 621
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 24 | 5
Available-for-sale, at fair value, Estimated Fair Value | 26,771 | 6,047
Total fixed maturity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | 112,037 | 100,667
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,703 | 4,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 27 | 29
Available-for-sale, at fair value, Estimated Fair Value | $ 117,713 | $ 104,638

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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