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7. Stockholders' Equity (Details) - shares	1 Months Ended				12 Months Ended
	Nov. 30, 2018	Aug. 31, 2017	Jun. 30, 2017	May 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	178,911	9,200	1,500	2,500
Common Class A [Member]
Class of Stock [Line Items]
Shares, Issued					24,884,000	24,679,000	24,454,000	24,230,000
Stock Issued During Period, Shares, Conversion of Convertible Securities					30,000	34,000	13,000
Stock Issued During Period, Shares, New Issues					175,000	191,000	211,000
Common Stock, Voting Rights					.10
Election Percentage for Board of Directors					25.00%
Common Class B [Member]
Class of Stock [Line Items]
Shares, Issued					5,096,000	5,108,000	5,124,000	5,131,000
Stock Issued During Period, Shares, Conversion of Convertible Securities					(30,000)	(34,000)	(13,000)
Stock Issued During Period, Shares, New Issues					18,000	18,000	6,000
Common Stock, Voting Rights					1
Election Percentage for Board of Directors					75.00%

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