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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-For-Sale Securities
Amortized Cost	$ 29,460	$ 37,010
Gross Unrealized Gain	739	817
Gross Unrealized (Losses)	0	0
Estimated Fair Value	30,199	37,827
Tax-exempt municipal securities
Available-For-Sale Securities
Amortized Cost	18,520	19,924
Gross Unrealized Gain	465	365
Gross Unrealized (Losses)	0	0
Estimated Fair Value	18,985	20,289
Corporate debt securities
Available-For-Sale Securities
Amortized Cost	10,940	17,086
Gross Unrealized Gain	274	452
Gross Unrealized (Losses)	0	0
Estimated Fair Value	$ 11,214	$ 17,538

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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).

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