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7. Stockholders' Equity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common Class A [Member]
Class of Stock [Line Items]
Shares, Issued	25,073	24,966	24,884	24,679
Stock Issued During Period, Shares, Conversion of Convertible Securities	(32)	(24)	(30)
Stock Issued During Period, Shares, New Issues	75	58	175
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	5,076	5,090	5,096	5,108
Stock Issued During Period, Shares, Conversion of Convertible Securities	(32)	(24)	(30)
Stock Issued During Period, Shares, New Issues	18	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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