Marketable Securities (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Gain (Loss) on Investments [Line Items]
Maximum maturity of debt securities (less than 5 years)			5 years
Accumulated pre-tax unrealized gains for marketable securities	$ 73,000		$ 73,000		$ 229,000
Proceeds from sales of available-for-sale marketable securities	0	$ 0	225,000	$ 0
Cost	$ 6,000,000.0		6,000,000.0		1,300,000
Unrealized gains or losses on marketable securities			$ 0		$ 0

Marketable Securities Classified As Cash Equivalents, Cost

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- Definition

Maximum Maturity Of Debt Securities

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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)
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- Definition

Amount of unrealized gain (loss) on investment in marketable security.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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