Unaudited Condensed Consolidated Balance Sheets (Parenthetical)	Jun. 30, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares
Class A Common Stock
Common stock, par value (in dollars per share) \| $ / shares	$ 1	$ 1
Common stock, shares outstanding (in shares) \| shares	5,595,368	5,489,615
Class B Common Stock
Common stock, par value (in dollars per share) \| $ / shares	$ 1	$ 1
Common stock, shares outstanding (in shares) \| shares	1,566,643	1,568,210
Common stock, convertible conversion ratio	1	1

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant