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7. Stockholders' Equity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Class A [Member]
Class of Stock [Line Items]
Shares, Issued	25,162	25,134	25,073	24,966
Stock Issued During Period, Shares, Conversion of Convertible Securities	(20)	(16)	(32)
Stock Issued During Period, Shares, New Issues	8	45	75
Common Stock, Voting Rights	0.1
Election Percentage for Board of Directors	25.00%
Common Class B [Member]
Class of Stock [Line Items]
Shares, Issued	5,074	5,078	5,076	5,090
Stock Issued During Period, Shares, Conversion of Convertible Securities	(20)	(16)	(32)
Stock Issued During Period, Shares, New Issues	16	18	18
Common Stock, Voting Rights	one

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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