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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-For-Sale Securities |  |
Amortized Cost | $ 28,330 | $ 29,444
Gross Unrealized Gain | 36 | 434
Gross Unrealized (Losses) | (304) | 0
Estimated Fair Value | 28,062 | 29,878
Tax-exempt municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 18,572 | 18,546
Gross Unrealized Gain | 31 | 271
Gross Unrealized (Losses) | (232) | 0
Estimated Fair Value | 18,371 | 18,817
Corporate debt securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 9,758 | 10,898
Gross Unrealized Gain | 5 | 163
Gross Unrealized (Losses) | (72) | 0
Estimated Fair Value | $ 9,691 | $ 11,061

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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=123581744&loc=d3e27161-111563 + Details
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