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7. Stockholders' Equity (Details) - shares	1 Months Ended					12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	Jun. 30, 2019	May 31, 2019	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	22,343	14,745	25,977	25,421	178,911
Common Class A [Member]
Class of Stock [Line Items]
Shares, Issued						24,966,000	24,884,000	24,679,000	24,454,000
Stock Issued During Period, Shares, Conversion of Convertible Securities						(24,000)	(30,000)	(34,000)
Stock Issued During Period, Shares, New Issues						58,000	175,000	191,000
Common Stock, Voting Rights						.10
Election Percentage for Board of Directors						25.00%
Common Class B [Member]
Class of Stock [Line Items]
Shares, Issued						5,090,000	5,096,000	5,108,000	5,124,000
Stock Issued During Period, Shares, Conversion of Convertible Securities						(24,000)	(30,000)	(34,000)
Stock Issued During Period, Shares, New Issues						18,000	18,000	18,000
Common Stock, Voting Rights						1
Election Percentage for Board of Directors						75.00%

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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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