Summary of Significant Accounting Policies - Common Shares Outstanding (Details) - shares	3 Months Ended
Jun. 30, 2021	Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	4,251,015	4,243,716
Vesting of restricted stock unit awards (in shares)	5,700	8,544
Shares withheld to cover taxes upon vesting of restricted stock unit awards (in shares)	(1,798)	(1,245)
Ending balance (in shares)	4,257,378	4,251,015
Performance Unit Awards
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of performance share unit awards (in shares)	2,461

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

+ Details

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

+ References

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