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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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